Personally, I'd emphasize combos and additional offensive ninjutsu. Specific ninja depend on where you're fighting. What level are you?

My rules:
1. Never go anywhere without a healer, except for the Kyuubi Invasion.
2. Have offensive jutsu that you c*e frequently.
3. Have clones/shields protecting vital characters, like medics.

And for Scarlet Blaze specifically, I'd say to take advantage of the Genjutsu Mirror Return, and level up.