I beat it with Gakido, Shurado, and Tsunade. Use a team with big combos like Sasuke, Tenten, and Karin.

For earth main characters. I used MC and another interrupter character. I would interrupt mainly poison attacks from 1st wave, shizune, Karin. Then I would have Sakura. She is the best healer for this event for f2p standards. Then the last one is a character that can start a 8+ combo with. This won't be easy to pull off all the time. Hopefully with you or your other interrupter you can get more than 6+ and you can beat this on difficult. Do not go auto. Every step is vital and the rewards are too good to go lazy on this. Keep at it everyone. This is a great event.

I used MC, Guy, Neji, and Kabuto.

Any f2p earth user will be able to get past easy mode with this setup.

what setup did you use on the mc?

I used kakashi neji and kabuto... Barely can do easy, but it works

2, 3, 1, 1, and 3.

This is what I used for hanzo and work just great, complete alone without problems, first use kabuto for clones, after 2 second round of poison use sakura a sasuke (use sakura only after all the poison) against shizune wait until she heals to use sasuke kirin, 8 combo and the standard woul do the rest, against hanzo and karin focus karin and use sakura after the second round of poison, karin should be after 2 combos, then finish hanzo, I hope that helps you