User blog comment:Water Dragon Slayer/DREAM BATTLE CHRONICLES: SIXTH MATCH!/@comment-11966702-20130821134614/@comment-5268982-20130821175254

Here are some suggestions for you.

Minerva vs. Ultear, because it's Space vs. Time

Laxus vs. Jellal, because...both are strong, I guess.

Kagura vs. Ikaruga because both use katanas.