Theodore is a minor character in the Persona Q: Side P4 Manga.

Velvet attendants tend to have less lines than other characters-- please keep this in mind

Theodore in English is voiced by Bryce Papenbrook, here are some speaking examples. Despite his canon VA, feel free to be a little creative with the voice if you wish as long as it fits the character. 

He doesn't talk much so feel free to pick a few lines from the video or make some up!