(first time commenting on a fandom wiki so apologizes if this goes wrong)
I thought of 2 match ups for Kevin
J from Ice Scream, their main connection is that they're crafty kids who're dealing with dangerous criminals or well I guess criminals for Kevin.
and the other opponent for him I thougth of is Charlie Bucket, their main connection is that they both seemed like normal kids but they've shown to be more than that. (Charlie would have the abilities, items and stats he gets in the video games)