Inazuma strikes me as an eccentric Englishman but the orange hair throws me off so maybe Irish or Scotish or Icelandic or .
Iva is weird with his Df he may be able to change his skin color, ethnicity, etc. but I'll say he was originally German.
BW:
Mr. 1 is obviously black and from L.A.
Bentham is Jewish American/British and of Lithuanian Jewish ancestry
Mr. 13 is Guatemalan
Miss Friday is American from Arizona
Lasso is Armenian(I know hard to tell)
Banchi's from the Gobi dessert
Mr. 11 is half Spaniard and half English(He's like an older looking white Zoro reject)
Miss Monday is black, probably Haitian
Mr. 9 is a mutt but the most dominant is his Scottish blood
Mr. 7 is Danish
Miss Valentine's Day is most likely from Amsterdam, The Netherlands
Miss Merry Christmas is w/e Rosie O'Donell & Rosanne are…
Miss Goldenweek/April Fools Day is a ginger so it really doesn't matter
Miss Doublefinger is a Slavic whore
Mr. 5 is black and of West Indian heritage; pick an island it doesn't matter.
Mr. 4 is Irish raised in Irish Catholic family in Wisconsin
Mr. 3' real name Galdino is Italian, somewhere in northern Italy, probably Milan