So besides being an eccentric genius, what do you think Scratch's personality is gonna be like?

I think if he gets revealed with voice lines in episode 9 (flashback or otherwise), he's gonna get portrayed as an anxiety ridden neurotic geek with a nasally voice who sounds either like Richard Steven Horvitz or Woody Allen.

I think he'd be a lot like Pomni from the first 3 episodes in terms of temperament.