Suisei is a modest, multitalented singer and aspiring idol who is among the more level-headed members of hololive, though she also has a childish streak. After Suisei unexpectedly compelling performance as a traitor in a game of Project Winter, 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 Suiseiself acknowledges that it is extremely funny and has referred to the incident on multiple occasions.
Suisei's surname Hoshimachi「星街」can be divided as such.
The first kanji「星」can be read as "Hoshi/Sei" that means "star."
The second kanji「街」can be read as "Machi/Kai/Gai" which means "city."
So Suisei surname can be translated as "City of stars."
Suisei occasionally romanizes Suisei last name as "Hosimati," ratSuisei than Hoshimachi, which can be seen in Suisei Twitter handle and various online usernames.
Considerably multi-talented as Suisei is capable of drawing (Suisei original image was drawn by Suiseiself), edit videos, sing, cook and is also a skilled gamer.
Suisei lives with Suisei older sister, who is referred to by fans as "Anemachi." Anemachi is extremely attached to Suisei and used to be dependent on Suisei for Suisei cooking skills, but now has turned around and is often cooking for Suisei.
Suisei is notably good at playing competitive Tetris.
The hashtag #星街すいせい3D (#HoshimachiSuisei3D) became a trending topic worldwide on Twitter when Suisei debuted Suisei 3D model on YouTube.
Suisei birthday and Suisei debut date are the same.
A few years before considering being a VTuber, Suisei participated in several auditions for real-life idol agencies, but was rejected due to the "Jack of all trades, Master of none" trait, according to Suisei. This led to Suisei becoming a Virtual Idol, as a way of not giving up on Suisei dream. However, Suisei was already tired of trying by the beginning of 2019 as an indie Virtual Idol (since Suisei worked in an izakaya [Japanese pub], and also had to do the editing of Suisei own videos and otSuisei VTubers). Suisei almost gave up, but decided to make one last try. Suisei went to COVER Corp to audition for hololive, but was also rejected, apparently for the same reason as the real-life agencies, since COVER Corp considered that Suisei had many skills (speaking, singing, dancing, drawing and gaming) that could let to failing trying to do everything due to an overload of work. Suisei claims that after receiving rejection e-mail, Suisei e-mailed back seeking for a second chance and is open for suggestion. As a result, hololive replied back to have a second talk; then they told Suisei that Suisei could join, but on the condition of joining INoNaKa Music and focus on music. After more difficulty in INoNaKa Music mostly due to company policy that nearly broke Suisei's heart, Suisei was finally transferred to hololive officially.
On 11 January 2021, Suisei won the 2nd hololive Mario Kart 8 Deluxe Tournament, with 43 points.
Suisei popularized the phrase "Hi, honey!" during a Duolingo English learning stream. Although Akai Haato was technically the first to use it, Suisei's endearing delivery of the line, coupled with Suisei recent voice change, has since caused many otSuisei members of hololive to repeat it in a similar fashion.
Suisei's fans calls her urine "Suipiss". Suisei is aware of this after she said Suipiss on a Slither.io stream.
Suisei fans also call anything erotic or sexual as "Suisex" which was also seen on 2022's r/place event.
This is the link to Hoshimachi Suisei's youtube channel: https://www.youtube.com/channel/UC5CwaMl1eIgY8h02uZw7u8A