diff --git a/frontend/src/App.css b/frontend/src/App.css
index c45a677..12c601d 100644
--- a/frontend/src/App.css
+++ b/frontend/src/App.css
@@ -5573,6 +5573,141 @@ a.app-footer__about:hover,
   animation: pageEnter 250ms ease-out;
 }
 
+/* ── Personality Profile ───────────────────────────────────────────────────── */
+
+.personality-profile {
+  margin: 1.5rem 0;
+}
+
+.personality-profile__toggle {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  background: none;
+  border: 1px solid var(--color-border);
+  border-radius: 8px;
+  padding: 0.75rem 1rem;
+  width: 100%;
+  cursor: pointer;
+  color: var(--color-text-primary);
+  transition: background 150ms ease;
+}
+
+.personality-profile__toggle:hover {
+  background: var(--color-bg-surface-hover);
+}
+
+.personality-profile__heading {
+  margin: 0;
+  font-size: 1.1rem;
+  font-weight: 600;
+}
+
+.personality-profile__chevron {
+  margin-left: auto;
+  font-size: 0.9rem;
+  transition: transform 250ms ease;
+  color: var(--color-text-muted);
+}
+
+.personality-profile__chevron--open {
+  transform: rotate(90deg);
+}
+
+.personality-profile__collapse {
+  display: grid;
+  transition: grid-template-rows 300ms ease;
+}
+
+.personality-profile__inner {
+  overflow: hidden;
+  min-height: 0;
+}
+
+.personality-profile__summary {
+  color: var(--color-text-secondary);
+  font-size: 0.95rem;
+  line-height: 1.6;
+  margin: 1rem 0;
+  padding: 0 0.25rem;
+}
+
+.personality-profile__cards {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
+  gap: 1rem;
+  margin-bottom: 1rem;
+}
+
+.personality-profile__card {
+  background: var(--color-bg-surface);
+  border: 1px solid var(--color-border);
+  border-radius: 8px;
+  padding: 1rem;
+}
+
+.personality-profile__card-title {
+  margin: 0 0 0.75rem;
+  font-size: 0.95rem;
+  font-weight: 600;
+  color: var(--color-accent);
+}
+
+.personality-profile__dl {
+  display: grid;
+  grid-template-columns: auto 1fr;
+  gap: 0.25rem 0.75rem;
+  margin: 0 0 0.75rem;
+  font-size: 0.85rem;
+}
+
+.personality-profile__dl dt {
+  color: var(--color-text-muted);
+  font-weight: 500;
+}
+
+.personality-profile__dl dd {
+  margin: 0;
+  color: var(--color-text-primary);
+}
+
+.personality-profile__pill-label {
+  display: block;
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+  margin-bottom: 0.25rem;
+}
+
+.personality-profile__pills {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.375rem;
+  margin-bottom: 0.5rem;
+}
+
+.personality-profile__booleans {
+  display: flex;
+  flex-direction: column;
+  gap: 0.375rem;
+  font-size: 0.85rem;
+  margin-top: 0.5rem;
+}
+
+.personality-profile__bool {
+  color: var(--color-text-muted);
+}
+
+.personality-profile__bool--yes {
+  color: var(--color-badge-approved-text);
+}
+
+.personality-profile__meta {
+  color: var(--color-text-muted);
+  font-size: 0.8rem;
+  padding: 0 0.25rem;
+  margin-bottom: 0.5rem;
+}
+
 /* ── Admin Technique Pages ────────────────────────────────────────────────── */
 
 .admin-page {
diff --git a/frontend/src/api/creators.ts b/frontend/src/api/creators.ts
index f7e467e..be72392 100644
--- a/frontend/src/api/creators.ts
+++ b/frontend/src/api/creators.ts
@@ -33,6 +33,39 @@ export interface CreatorTechniqueItem {
   created_at: string;
 }
 
+export interface PersonalityVocabulary {
+  signature_phrases: string[];
+  technical_jargon_level: string;
+  filler_words: string[];
+  distinctive_terms: string[];
+}
+
+export interface PersonalityTone {
+  formality: string;
+  energy: string;
+  humor_frequency: string;
+  teaching_style: string;
+  descriptors: string[];
+}
+
+export interface PersonalityStyleMarkers {
+  explanation_approach: string;
+  uses_analogies: boolean;
+  uses_sound_words: boolean;
+  self_references_frequency: string;
+  audience_engagement: string;
+}
+
+export interface PersonalityProfile {
+  vocabulary: PersonalityVocabulary;
+  tone: PersonalityTone;
+  style_markers: PersonalityStyleMarkers;
+  summary: string;
+  extracted_at: string;
+  transcript_sample_size: number;
+  model_used: string;
+}
+
 export interface CreatorDetailResponse {
   id: string;
   name: string;
@@ -52,6 +85,7 @@ export interface CreatorDetailResponse {
   follower_count: number;
   techniques: CreatorTechniqueItem[];
   genre_breakdown: Record<string, number>;
+  personality_profile: PersonalityProfile | null;
 }
 
 export interface CreatorListParams {
diff --git a/frontend/src/components/PersonalityProfile.tsx b/frontend/src/components/PersonalityProfile.tsx
new file mode 100644
index 0000000..2c43f87
--- /dev/null
+++ b/frontend/src/components/PersonalityProfile.tsx
@@ -0,0 +1,153 @@
+/**
+ * Collapsible personality profile section for the CreatorDetail page.
+ *
+ * Shows vocabulary, tone, and style markers extracted from creator transcripts.
+ * Renders nothing if profile is null. Uses CSS grid-template-rows 0fr/1fr
+ * for smooth collapse/expand animation (per KNOWLEDGE.md).
+ */
+
+import { useState } from "react";
+import type { PersonalityProfile as ProfileType } from "../api/creators";
+
+interface Props {
+  profile: ProfileType | null;
+}
+
+export default function PersonalityProfile({ profile }: Props) {
+  const [expanded, setExpanded] = useState(false);
+
+  if (!profile) return null;
+
+  return (
+    <section className="personality-profile">
+      <button
+        className="personality-profile__toggle"
+        onClick={() => setExpanded((v) => !v)}
+        aria-expanded={expanded}
+      >
+        <h2 className="personality-profile__heading">Personality Profile</h2>
+        <span
+          className={`personality-profile__chevron${expanded ? " personality-profile__chevron--open" : ""}`}
+          aria-hidden="true"
+        >
+          ▸
+        </span>
+      </button>
+
+      <div
+        className="personality-profile__collapse"
+        style={{
+          gridTemplateRows: expanded ? "1fr" : "0fr",
+        }}
+      >
+        <div className="personality-profile__inner">
+          {/* Summary */}
+          <p className="personality-profile__summary">{profile.summary}</p>
+
+          <div className="personality-profile__cards">
+            {/* Teaching Style */}
+            <div className="personality-profile__card">
+              <h3 className="personality-profile__card-title">Teaching Style</h3>
+              <dl className="personality-profile__dl">
+                <dt>Formality</dt>
+                <dd>{profile.tone.formality}</dd>
+                <dt>Energy</dt>
+                <dd>{profile.tone.energy}</dd>
+                <dt>Teaching style</dt>
+                <dd>{profile.tone.teaching_style}</dd>
+                <dt>Humor</dt>
+                <dd>{profile.tone.humor_frequency}</dd>
+              </dl>
+              {profile.tone.descriptors.length > 0 && (
+                <div className="personality-profile__pills">
+                  {profile.tone.descriptors.map((d) => (
+                    <span key={d} className="pill pill--tag">
+                      {d}
+                    </span>
+                  ))}
+                </div>
+              )}
+            </div>
+
+            {/* Vocabulary */}
+            <div className="personality-profile__card">
+              <h3 className="personality-profile__card-title">Vocabulary</h3>
+              <dl className="personality-profile__dl">
+                <dt>Jargon level</dt>
+                <dd>{profile.vocabulary.technical_jargon_level}</dd>
+                {profile.vocabulary.filler_words.length > 0 && (
+                  <>
+                    <dt>Filler words</dt>
+                    <dd>{profile.vocabulary.filler_words.join(", ")}</dd>
+                  </>
+                )}
+              </dl>
+              {profile.vocabulary.signature_phrases.length > 0 && (
+                <>
+                  <span className="personality-profile__pill-label">
+                    Signature phrases
+                  </span>
+                  <div className="personality-profile__pills">
+                    {profile.vocabulary.signature_phrases.map((p) => (
+                      <span key={p} className="pill pill--tag">
+                        "{p}"
+                      </span>
+                    ))}
+                  </div>
+                </>
+              )}
+              {profile.vocabulary.distinctive_terms.length > 0 && (
+                <>
+                  <span className="personality-profile__pill-label">
+                    Distinctive terms
+                  </span>
+                  <div className="personality-profile__pills">
+                    {profile.vocabulary.distinctive_terms.map((t) => (
+                      <span key={t} className="pill pill--tag">
+                        {t}
+                      </span>
+                    ))}
+                  </div>
+                </>
+              )}
+            </div>
+
+            {/* Style */}
+            <div className="personality-profile__card">
+              <h3 className="personality-profile__card-title">Style</h3>
+              <dl className="personality-profile__dl">
+                <dt>Explanation approach</dt>
+                <dd>{profile.style_markers.explanation_approach}</dd>
+                <dt>Audience engagement</dt>
+                <dd>{profile.style_markers.audience_engagement}</dd>
+                <dt>Self-references</dt>
+                <dd>{profile.style_markers.self_references_frequency}</dd>
+              </dl>
+              <div className="personality-profile__booleans">
+                <span
+                  className={`personality-profile__bool${profile.style_markers.uses_analogies ? " personality-profile__bool--yes" : ""}`}
+                >
+                  {profile.style_markers.uses_analogies ? "✓" : "✗"} Uses
+                  analogies
+                </span>
+                <span
+                  className={`personality-profile__bool${profile.style_markers.uses_sound_words ? " personality-profile__bool--yes" : ""}`}
+                >
+                  {profile.style_markers.uses_sound_words ? "✓" : "✗"} Uses
+                  sound words
+                </span>
+              </div>
+            </div>
+          </div>
+
+          {/* Metadata */}
+          <div className="personality-profile__meta">
+            Based on {profile.transcript_sample_size} transcript
+            {profile.transcript_sample_size !== 1 ? "s" : ""} · extracted{" "}
+            {new Date(profile.extracted_at).toLocaleDateString()}
+          </div>
+        </div>
+      </div>
+    </section>
+  );
+}
diff --git a/frontend/src/pages/CreatorDetail.tsx b/frontend/src/pages/CreatorDetail.tsx
index bce3116..c8f4ee7 100644
--- a/frontend/src/pages/CreatorDetail.tsx
+++ b/frontend/src/pages/CreatorDetail.tsx
@@ -19,6 +19,7 @@ import { useAuth } from "../context/AuthContext";
 import CreatorAvatar from "../components/CreatorAvatar";
 import { SocialIcon } from "../components/SocialIcons";
 import ChatWidget from "../components/ChatWidget";
+import PersonalityProfile from "../components/PersonalityProfile";
 import SortDropdown from "../components/SortDropdown";
 import TagList from "../components/TagList";
 import { catSlug } from "../utils/catSlug";
@@ -393,6 +394,9 @@ export default function CreatorDetail() {
         )}
       </div>
 
+      {/* Personality Profile */}
+      <PersonalityProfile profile={creator.personality_profile ?? null} />
+
       {/* Technique pages */}
       <section className="creator-techniques">
         <div className="creator-techniques__header">
diff --git a/frontend/tsconfig.app.tsbuildinfo b/frontend/tsconfig.app.tsbuildinfo
index 698cd57..852419b 100644
--- a/frontend/tsconfig.app.tsbuildinfo
+++ b/frontend/tsconfig.app.tsbuildinfo
@@ -1 +1 @@
-{"root":["./src/App.tsx","./src/main.tsx","./src/vite-env.d.ts","./src/api/admin-pipeline.ts","./src/api/admin-techniques.ts","./src/api/auth.ts","./src/api/chat.ts","./src/api/client.ts","./src/api/consent.ts","./src/api/creator-dashboard.ts","./src/api/creators.ts","./src/api/follows.ts","./src/api/highlights.ts","./src/api/index.ts","./src/api/reports.ts","./src/api/search.ts","./src/api/stats.ts","./src/api/techniques.ts","./src/api/topics.ts","./src/api/videos.ts","./src/components/AdminDropdown.tsx","./src/components/AppFooter.tsx","./src/components/AudioWaveform.tsx","./src/components/CategoryIcons.tsx","./src/components/ChapterMarkers.tsx","./src/components/ChatWidget.tsx","./src/components/ConfirmModal.tsx","./src/components/CopyLinkButton.tsx","./src/components/CreatorAvatar.tsx","./src/components/ImpersonationBanner.tsx","./src/components/PlayerControls.tsx","./src/components/ProtectedRoute.tsx","./src/components/ReportIssueModal.tsx","./src/components/SearchAutocomplete.tsx","./src/components/SocialIcons.tsx","./src/components/SortDropdown.tsx","./src/components/TableOfContents.tsx","./src/components/TagList.tsx","./src/components/ToggleSwitch.tsx","./src/components/TranscriptSidebar.tsx","./src/components/VideoPlayer.tsx","./src/context/AuthContext.tsx","./src/hooks/useCountUp.ts","./src/hooks/useDocumentTitle.ts","./src/hooks/useMediaSync.ts","./src/hooks/useSortPreference.ts","./src/pages/About.tsx","./src/pages/AdminAuditLog.tsx","./src/pages/AdminPipeline.tsx","./src/pages/AdminReports.tsx","./src/pages/AdminTechniquePages.tsx","./src/pages/AdminUsers.tsx","./src/pages/ChapterReview.tsx","./src/pages/ChatPage.tsx","./src/pages/ConsentDashboard.tsx","./src/pages/CreatorDashboard.tsx","./src/pages/CreatorDetail.tsx","./src/pages/CreatorSettings.tsx","./src/pages/CreatorTiers.tsx","./src/pages/CreatorsBrowse.tsx","./src/pages/HighlightQueue.tsx","./src/pages/Home.tsx","./src/pages/Login.tsx","./src/pages/Register.tsx","./src/pages/SearchResults.tsx","./src/pages/SubTopicPage.tsx","./src/pages/TechniquePage.tsx","./src/pages/TopicsBrowse.tsx","./src/pages/WatchPage.tsx","./src/utils/catSlug.ts","./src/utils/citations.tsx"],"version":"5.6.3"}
\ No newline at end of file
+{"root":["./src/App.tsx","./src/main.tsx","./src/vite-env.d.ts","./src/api/admin-pipeline.ts","./src/api/admin-techniques.ts","./src/api/auth.ts","./src/api/chat.ts","./src/api/client.ts","./src/api/consent.ts","./src/api/creator-dashboard.ts","./src/api/creators.ts","./src/api/follows.ts","./src/api/highlights.ts","./src/api/index.ts","./src/api/reports.ts","./src/api/search.ts","./src/api/stats.ts","./src/api/techniques.ts","./src/api/topics.ts","./src/api/videos.ts","./src/components/AdminDropdown.tsx","./src/components/AppFooter.tsx","./src/components/AudioWaveform.tsx","./src/components/CategoryIcons.tsx","./src/components/ChapterMarkers.tsx","./src/components/ChatWidget.tsx","./src/components/ConfirmModal.tsx","./src/components/CopyLinkButton.tsx","./src/components/CreatorAvatar.tsx","./src/components/ImpersonationBanner.tsx","./src/components/PersonalityProfile.tsx","./src/components/PlayerControls.tsx","./src/components/ProtectedRoute.tsx","./src/components/ReportIssueModal.tsx","./src/components/SearchAutocomplete.tsx","./src/components/SocialIcons.tsx","./src/components/SortDropdown.tsx","./src/components/TableOfContents.tsx","./src/components/TagList.tsx","./src/components/ToggleSwitch.tsx","./src/components/TranscriptSidebar.tsx","./src/components/VideoPlayer.tsx","./src/context/AuthContext.tsx","./src/hooks/useCountUp.ts","./src/hooks/useDocumentTitle.ts","./src/hooks/useMediaSync.ts","./src/hooks/useSortPreference.ts","./src/pages/About.tsx","./src/pages/AdminAuditLog.tsx","./src/pages/AdminPipeline.tsx","./src/pages/AdminReports.tsx","./src/pages/AdminTechniquePages.tsx","./src/pages/AdminUsers.tsx","./src/pages/ChapterReview.tsx","./src/pages/ChatPage.tsx","./src/pages/ConsentDashboard.tsx","./src/pages/CreatorDashboard.tsx","./src/pages/CreatorDetail.tsx","./src/pages/CreatorSettings.tsx","./src/pages/CreatorTiers.tsx","./src/pages/CreatorsBrowse.tsx","./src/pages/HighlightQueue.tsx","./src/pages/Home.tsx","./src/pages/Login.tsx","./src/pages/Register.tsx","./src/pages/SearchResults.tsx","./src/pages/SubTopicPage.tsx","./src/pages/TechniquePage.tsx","./src/pages/TopicsBrowse.tsx","./src/pages/WatchPage.tsx","./src/utils/catSlug.ts","./src/utils/citations.tsx"],"version":"5.6.3"}
\ No newline at end of file