Left+1 for snowman ice clone
Right+4 for polar bear clone
Down+3 to make them drop from ceiling after throw brute
Hold both triggers to make head fall after slide brute
I think there are more clone ones where it's just Sub but you can change his pose or something. I didn't bother to look those up.
So, I just unlocked Sub's Frost Bite brutality for which you need to land three Creeping Ice in a match and end with same move. After doing so several times, it doesn't work. Wtf?