Shizuku AI
Category: AI Agents
A character-focused AI laboratory developing the world's most emotionally resonant AI VTubers and companions through high-speed generative technology and Japanese character design. Shizuku AI was founded in 2024. The company is led by Akio Kodaira. Based in San Francisco, USA. Team size: 2-10. Total funding raised: $15.0M. Latest round: Seed. Key investors include Andreessen Horowitz (a16z), DeNA.
AMW Analysis
Shizuku AI develops emotionally resonant AI VTubers and digital companions using high-speed generative technology and Japanese character design. Its value proposition centers on real-time visual and vocal responsiveness at over 90 frames per second, aiming to create proactive, emotionally deep interactions. The company is based in San Francisco, founded in 2024, and has raised $15 million in seed funding from Andreessen Horowitz and DeNA.
Recent news shows that a16z led the seed round at a ¥12 billion valuation, marking the firm’s first investment in a Japanese AI startup. The coverage highlights a shift from static AI tools to proactive digital companions that evolve through community data. The funding round signals growing interest in merging Japanese cultural IP with US-led AI infrastructure, and positions Shizuku AI as a player in the character economy. The company’s technology is already engaging thousands of users, scaling its multimodal AI VTubers with real-time interaction capabilities.
AMW analysis, generated from 3 tracked news signals.
- Founded
- 2024
- Headquarters
- San Francisco, USA
- Team size
- 2-10
- Total funding
- $15.0M
Value proposition
Eliminates the lag and monotony of traditional AI interactions by providing real-time (90+ FPS) visual and vocal responsiveness, creating a 'proactive' and emotionally deep companion experience.
Products and solutions
Shizuku (Flagship AI VTuber v2.0), Shizuku Lab (Community-driven creator platform and developer ecosystem), Real-time Multimodal Interaction Engine, StreamDiffusion (High-speed open-source image generation pipeline)
Unique value
Combines Silicon Valley's cutting-edge real-time AI research with Japanese character-centric cultural expertise ('Aki-sensei's' dual background).
Target customer
VTuber/Anime fans, digital companion users, social media creators, and platform partners (YouTube, Discord, X)
Industries served
Entertainment & Streaming, Generative AI, Social Media & Community, Digital Companionship
Technology advantage
Proprietary utilization of 'StreamDiffusion,' achieving 90+ FPS real-time image generation, allowing for instantaneous visual reactions and live streaming capability that exceeds the speed of industry standard diffusion models.
How they differentiate
Leverages the proprietary 'StreamDiffusion' framework to achieve 90+ FPS real-time visual responsiveness, enabling instantaneous emotional and physical reactions that traditional text-focused LLM competitors lack. It blends Silicon Valley's cutting-edge real-time generative research with the cultural expertise of Japanese character design.
Main competitors
Character.ai, Sakura.fm (Sakura AI), Rinna Co., Ltd., Moemate
Key partnerships
Andreessen Horowitz (a16z) - Lead Investor, DeNA - Strategic Investor, UC Berkeley AI Research Community, Discord-based 'Shizuku Lab' creator community
Notable customers
YouTube, Discord, X (Platform Partners/Ecosystems)
Major milestones
Launch of the first bilingual AI VTuber 'Shizuku' on YouTube (Jan 2023), Release of 'StreamDiffusion' framework, setting a world record for real-time image generation speed (Dec 2023), Selection as Andreessen Horowitz's (a16z) first-ever public investment in a Japanese-related AI startup (Feb 2026), Secured $15M Seed round at a valuation of approximately $75M (Feb 2026), Official launch of 'Shizuku v2.0' featuring proactive conversational capabilities (Feb 2026)
Growth metrics
The company's open-source generation pipeline 'StreamDiffusion' achieved over 10,000 GitHub stars within its first year; the flagship AI VTuber 'Shizuku' reached thousands of followers during its alpha phase on YouTube and Discord.
Market positioning
Premium AI Companion & Virtual IP Laboratory
Geographic focus
Global (Headquartered in San Francisco with a dedicated AI research lab in Japan), specifically targeting North America and Asia-Pacific anime/VTuber markets.
Patents and IP
CEO Akio Kodaira is the lead author of the 'StreamDiffusion' technical framework (Open-source IP with over 10,000 GitHub stars); specific commercial patents not publicly disclosed.
About Akio Kodaira
Akio Kodaira (known as 'Aki-sensei') is a prominent AI researcher and entrepreneur with a Ph.D. from UC Berkeley. He is widely recognized for leading the development of 'StreamDiffusion,' a groundbreaking pipeline for real-time interactive image generation that achieved over 90 fps. His professional background includes research roles at Luma AI and Meta. He launched the AI VTuber 'Shizuku' in early 2023, which became a viral success and served as the foundation for founding Shizuku AI to develop advanced AI companions.
Latest news about Shizuku AI
- Shizuku AI raises seed round led by a16z for AI virtual YouTuber, valued at ~$800M
- Shizuku AI has secured seed funding led by a16z at a ¥12 billion valuation, the firm’s first investment in a Japanese AI startup. Led by StreamDiffusion creator Akio Kodaira, the company scales multim
- a16z has led the seed round for Shizuku AI, its first investment in a Japanese AI startup. Founded by Berkeley PhD Akio Kodaira, the firm merges Japanese character design with AI to build digital comp
- Andreessen Horowitz (a16z) has made its first Japan-related investment by backing Shizuku AI, a startup developing AI virtual companions. 🚀 This move follows a16z's record-breaking $15 billion fundrai
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Official website: https://shizuku.ai
