This is the team I use currently and I can typically stand my ground against Water main, Han, Roshi, Sailor Sakura.

Earth main (And some water main teams) are the best counters to Han. Earth is the only Main that can buff ANY type of ninja (Pose of Duel) and it can't be removed. (Shields can be removed to make Pose of Duel not activate, but when earth main does shield standard, Pose of Duel is reapplied to target ninja).

I'm completely f2p and can typically hold my own or even win against Han/Roshi/SS teams. Mostly due to their low damage output and my Roshi gets fed insane amounts of stacks - while enemy Roshi does not get any stacks at all because he isn't placed in front (Roshi's stack talent doesn't proc off Nin).

My team is also capable of getting chase 30 off each round. So it helps a lot.