If existing capcom character:
Dean from FF - Can play a bit like benimaru I guess
Carlos from FF - (Not sure if they would have someone who fights with a sword though)
Kyosuke from Rival Schools - Was too bad ass in CVS2 (even tho he was extremely low tier)
Anyone else from Rival Schools - Dude with benimaru hair and knife? maybe he can play like Yamazaki from CVS2
Colonel Wolfman from delta red (or any other delta red person - Maybe ginzu, who will play like Bao or Choi from KOF)
Dudleys Butler - A secret badass? (see below re salaryman)
Dude from an Arab country - looks like your typical arab dude with a box beard with kheffiyah and sunglasses. He would use “Sand” attacks, I pictured him playing similar to Oswald from KOF
Aborigini woman from Australia - Is a “crocodile hunter” like Steve Irwin. Uses “survival techniques”
Mounty from Canada - Picture the show Due South. Would play a bit like Heidern.
Sassy “drunk” woman from Ireland - Lookswise, imagine B.Jenet from Garou, but with red hair (obviously)
Grappler from one of the Nordic countries (Maybe Sweden) - Picture one of the dudes from World Strongman contest. Zangief type.
Indonesian Guy - Would wear a sarong and a muslim type “hat”. Would practice Silat, with a small knife.
Salaryman (any country) - would be the comic relief character. Would wear a suit and nerd glasses. Imagine phoenix wright with glasses. Would fight with briefcase. He knows how to fight because he was bullied at school and is secretly ripped and has several black belts in various martial arts. His win pose might actually reveal his true prowess. Cries when he physically lands attacks - even tho its him on the offensive - because he remembers all those bad childhood memories (lol) and he is getting his nerd revenge. Still has some teenage acne. Character name would actually BE Salaryman. Motivation for entering the tournament? to pay off his mortgage obviously.
Black dude or woman with huge afro USA? - Stuck in the 70s? speak with the jive turkey language like black dynamite. Plays like fei longish with nun chucks with Karim Abdul Jabbar underwear and shirt from game of death.
As you can see I like KOF alot, which isnt necessarily a bad thing (would love CVS3 btw if anyone cares)