If you're fire, you should really get Ukon Sakon and upgrade them ASAP. Ukon Sakon can dish out a boatload of damage, and the mystery packs a punch as well. I've found that a fully cultivated Ukon Sakon can deal quite a bit of damage - plus defense debuff - with their mystery.

With the event and all, you should really try to get the discounted Iruka as well because Iruka is OP as heck...at least if you use Leaf characters. Plus Ukon Sakon have a high hit count, so it's a lot easier for Iruka to activate his 10 combo chase.