Suisei is a modest, multi-talented singer and aspiring idol who is among the more level-headed members of hololive, though she also has a childish streak. She gained a reputation for remorseless sociopathy behind a facade of polite sweetness. No one seems to know how much of the "Psychopath Suisei" persona is real or not, but Suisei herself acknowledges that it is extremely funny and has referred to the incident on multiple occasions.

Hiding her 'inner psychopath', Suisei greets herself how she does on her crazily popular YouTube livestreams.

"It's your shooting star, your diamond in the rough, idol VTuber Hoshimachi Suisei!"