User blog comment:Chrismh/Everybody's Coord Design! Round 2: Repaying Kindness!/@comment-15568664-20181111164559/@comment-3237624-20181112011408

Oh, I had forgotten to mention a detail that I had just planned on including: Mariko can/will use any type for the time being. She's up for anything that stays within the rules.

A good rule of thumb is, if I don't mention it then it's not included. So since I didn't say "only use ___" pieces, you don't need to do it. So single or multiple typed is allowed.