A Monochroid (モノクロイド Monokuroido) is a virtual android in the Len'en Project that usually appear on JynX's Youtube channel, helping with explanations on videos related to Len'en.
All of their full names follow a set pattern:
||[character the monochroid is based on]
While their nicknames are based on the number zero from various languages:
- Rei: Japanese "零" (れい Rei)
- Zelo: English "Zero"
- Lin: Chinese "零" (Trad: Líng Cantonese: ling4)
- NiLU: Similar to English "nil"
Characters that are this species
- Rei (Monochroid[Rei] = _Type_iX01[Tsubakura];)
- Zelo (Monochroid[Zelo] = _Type_iX02[Yabusame];)
- Lin (Monochroid[Lin] = _Type_iX00[Rei];)
- NiLU (type currently unknown) - their name follows the same pattern as the other three and, similarly to them, they have pale white skin. In addition, the 6th anniversary illustration shows the 3 monochroids excited at NiLU appearing in the anniversary video, akin to "a relative being on TV". NiLU was confirmed to be a Monochroid in the 7th series anniversary video.