Kizuna AI is not a Vocaloid; she is a VTuber (virtual YouTuber) whose character later received a separate singing voice library for a different engine, CeVIO AI, called “Kizuna AI Original Singeroid #kzn.”

What Kizuna AI Actually Is

Kizuna AI is a Japanese virtual YouTuber and fictional character, originally created as a 3D avatar voiced by a human voice actress, Nozomi Kasuga.

Her content mainly consists of streams, gaming videos, talks, and music activities as a VTuber, not as a built‑in singing synthesizer like a traditional Vocaloid character.

Why People Get Confused

The confusion often comes from:

  • Her association with Vocaloid/J-pop culture and performing many Vocaloid and anisong covers.
  • The introduction of “#kzn,” a voice-synthesis character based on her voice, which behaves similarly to Vocaloid-style singing software.
  • Fan posts, memes, and forum discussions that loosely call any virtual singer “a Vocaloid,” even if it uses a different engine.

What #kzn Actually Is

“#kzn” (read “Kizuna”) is a singing voice library released for the CeVIO AI engine, marketed as “Kizuna AI Original Singeroid #kzn.”

This means #kzn is a CeVIO AI voicebank, not a Vocaloid voicebank, even though it fills a similar role as a virtual singer that producers can use in songs.

So, Is Kizuna AI a Vocaloid?

From a strict technical and fandom-definition standpoint:

  • Kizuna AI (the VTuber character) → VTuber/virtual entertainer, not a Vocaloid.
  • #kzn (her singing-synth counterpart) → CeVIO AI “Singeroid,” a non‑Vocaloid voicebank.

Fans might casually say she’s “like a Vocaloid,” but formally, the answer to “is Kizuna AI a Vocaloid?” is no.

TL;DR:
Kizuna AI is a VTuber whose voice was later turned into a CeVIO AI Singeroid (#kzn), so she is Vocaloid-adjacent in culture but not an official Vocaloid.