I am a professional Japanese voice-over artist and content evaluator specializing in AI training and TTS (Text-to-Speech) research. I have extensive experience recording thousands of phrases for AI datasets and performing multi-role conversational scripts with high precision. Technical Environment: I operate from a dedicated home studio equipped with an Audio-Technica AT2020 microphone and a Focusrite Scarlett Solo Gen4 audio interface. I can deliver high-quality, unprocessed RAW audio (24-bit/48kHz) that meets strict technical specifications. Specialized Skills: Beyond standard narration, I possess a unique vocal range including specialized techniques such as death metal vocals (growls), providing a diverse spectrum of voice data for advanced AI synthesis. I am also skilled in AI content evaluation (RLHF, LQA/MQM) and SEO strategies.

Koichi Tomikawa

I am a professional Japanese voice-over artist and content evaluator specializing in AI training and TTS (Text-to-Speech) research. I have extensive experience recording thousands of phrases for AI datasets and performing multi-role conversational scripts with high precision. Technical Environment: I operate from a dedicated home studio equipped with an Audio-Technica AT2020 microphone and a Focusrite Scarlett Solo Gen4 audio interface. I can deliver high-quality, unprocessed RAW audio (24-bit/48kHz) that meets strict technical specifications. Specialized Skills: Beyond standard narration, I possess a unique vocal range including specialized techniques such as death metal vocals (growls), providing a diverse spectrum of voice data for advanced AI synthesis. I am also skilled in AI content evaluation (RLHF, LQA/MQM) and SEO strategies.

Available to hire

I am a professional Japanese voice-over artist and content evaluator specializing in AI training and TTS (Text-to-Speech) research. I have extensive experience recording thousands of phrases for AI datasets and performing multi-role conversational scripts with high precision.

Technical Environment: I operate from a dedicated home studio equipped with an Audio-Technica AT2020 microphone and a Focusrite Scarlett Solo Gen4 audio interface. I can deliver high-quality, unprocessed RAW audio (24-bit/48kHz) that meets strict technical specifications.

Specialized Skills: Beyond standard narration, I possess a unique vocal range including specialized techniques such as death metal vocals (growls), providing a diverse spectrum of voice data for advanced AI synthesis. I am also skilled in AI content evaluation (RLHF, LQA/MQM) and SEO strategies.

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Experience Level

Expert
Expert

Language

Japanese
Fluent
English
Advanced

Work Experience

Freelance Language Evaluator
January 1, 2024 - Present
Evaluate Japanese-language content and AI-generated responses for relevance, accuracy, and clarity. Review documents and provide structured feedback to improve LLM outputs. Collaborate with international teams through written English communication.
Freelance Voice-over Artist & Content Creator
June 1, 2022 - Present
Provided Japanese voice-over services for international clients, including thousands of recorded phrases for AI training datasets with high precision and adherence to technical specs; recorded conversational scripts for TTS research (24-bit / 48kHz RAW audio delivery) and corporate narrations; performed audio QC and prepared read notes for Japanese TTS (naturalness / lip-sync).
Social Worker at Social Welfare Corporation
March 1, 2008 - June 1, 2022
Managed facility operations, admissions, and resident counseling for 14 years.

Education

B.A. in Economics at Kurume University
January 1, 2001 - January 1, 2005

Qualifications

Add your qualifications or awards here.

Industry Experience

Media & Entertainment, Non-Profit Organization
    uniE608 Professional Japanese Documentary Narration
    A deep, calm, and authoritative Japanese narration sample. Perfectly suited for documentaries, corporate videos, and educational content. video explainervideo narration
    uniE603 Versatile Japanese Character Voice
    Dynamic and expressive voice acting for gaming, animation, and creative AI storytelling. gaming animation acting
    uniE603 Energetic Japanese Commercial Voiceover
    High-energy, persuasive, and engaging tone designed for advertisements and promotional videos. advert commercial promo
    uniE603 Japanese Audiobook & Storytelling
    Consistent pacing and atmospheric delivery for long-form narration, audiobooks, and e-learning. audiobook storytelling elearning

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