He'd probably look similar to Talbot, hopefully much more handsome...
also, just for a info... Logan won't have a route (at least was what was said in Logan's twitter...)
Hopefully we can have a Logan route in the future... XD
Logan is a side character that one of the Patreons won with the giga pack (or something like that -> if I ever find the twitter post, I'll put the link here) and he's (for now, at least) just a side character