While initially a hothead when introduced, Espio has since become a calm, soft-spoken, serious, and disciplined person whose wariness and soulful character makes him a vital member of his team, and balances out the foolishness of his friends.

As this comic starts right after Sonic Forces, I suggest going for a voice type similar to his VA in said game, Matthew Mercer. Here's an example: https://youtu.be/LSdn8Ww5QTU?t=1m17s