Teruteru Hanamura is the only member of the Future Foundation with insomnia and lacks sleep all the time.  He also has a habit of running on good vibes and coffee, which is a concern for a lot of the members.  Along with his insomnia, he has multiple personalities that he can switch on and off from time to time.  I would recommend using the Teruteru voice from the DR2 game for reference.  Also, this person must be able to replicate the following personalities:

Flirty  ( a flirty boi, but with chaotic gay energy)

Crazy  ( the out of control lunatic that goes into fits of laughter often)

Angry ( a very AnGErY boi, always ticked off, has a somewhat strong accent)

Softy  ( a soft little BiTCh, cries more often than not, talks in a medium-high quivery voice)

Loopy  ( looks and sounds like he's intoxicated/ drunk, but is actually sleep deprived; has a pretty strong accent)

Worry  ( worries about everything, always wears glasses in animation, has very strong accent)

Horny  ( desperate and horny as hell, always down for some "love action")

and Swifty ( a total clean freak, is paranoid that he wants to keep everything in perfect symmetry )