Actually team 2 is a perfect full f2p team but i would honestly use earth enhancement instead of pose of duel, given the fact shira is earth.

It's a blitz team if the enemy runs a buff remover is game over regardless, so is better to have +40% atk than +30%.

The definition of f2p ninja is a ninja that, by going for it, doesn't make you miss enough power to make you regret your choice once you get it.

So, basically, whatever costs more than 8k coupons and is not able to work as a move 1 ninja.