Shuichi Saihara

"'IM THE ULTIMATE IMPOSTER'"Shuichi revealing his true talent

Before the universe reset :
Before the universe reset Shuichi was a reccurring character in the Kyokoverse. He used to die frequently as well as try to drown people in his toilet.

(not canon)

After the universe reset :
After the universe reset Shuichi disappeared for a while. It was later reveled that he got sent to another dimension and got killed by his own hair. He later got revived by that dimension's Kaede who gecced to send him into the Kyokoverse dimension.

Shuichi helped Fuyuhiko defeat the void with Kaito by geccing (he also talked a lot about Raid Shadow Legends that day thanks to them for sponsoring the building fire and the bus crash)