Shuichi Saihara is one of the main protagonists of Danganronpa: V3, and his title is the Ultimate Detective. Shuichi has a nervous and timid, yet serious and polite personality. He tends to have low self esteem of himself, believing and assuming others can do things better than he can. But when duty calls, along with the support of his friends, he tends to have a stronger attitude about himself and his work as a young detective.

As a remnant, Shuichi's personality doesn't change all that much... but he is still very twisted and warped by that sweet taste of heartbreaking and mind melting despair. Shuichi usually spends most of his time with his fellow despaired classmates and is both fascinated/interested and close with them. He revels in his despair - possibly reveling in it a little too much? - but tends to still have his nervous and skittish tendencies if he gets spooked by something. Before being brainwashed by Junko, Shuichi would always have worries about the inevitable guilt that he would feel after solving cases... but not anymore. He CRAVES in the guilt he feels and doesn't mind too much when being pushed around by his classmates... and he isn't afraid to get his hands a little dirty and bloody as he happily spreads despair with his dear friends.

When it comes to Shuichi's voice, I'm definitely leaning towards something close to his English VA. However, I want to have his more meek and timid mannerisms stand out, like how he tends to stutter a little bit and has a more unsure and worried feeling to it. So I'd defiantly lean towards taking notes on the Japanese VA to emulate those mannerisms

Voices for Reference: https://www.youtube.com/watch?v=6EPhy4v3ATk

More info as a Remnant: https://www.tumblr.com/spittyfishy/691955208404779008/do-you-have-hcs-or-writing-on-how-shuichi-would