Dennis Wells - Ultimate Game Show Contestant - Dennis's memory is extremely good, and can remember random facts with ease. He does, however, quite lack common sense and that tends to be his downfall.  During conversation, he likes to people random useless info to try and impress them.

I imagine his voice as medium, and very average.

If I had to describe what I want his voice to sound like based on already existing Danganronpa characters, I would say Kiibo from Danganronpa V3. (without all the robot stuff)