Mei / Kisame / Ao is strong against GNW Tenten team. As long as Kisame keeps stealing chakra.
I am currently using

Mei / Sage / Sailor. Constant debuffs every turn and good sustain
Summon : Dog of Hell or Monkey King depends on how your position.
This post was last edited by Petrichor

I'm f2p and cheap af player. so I slowly invested on her frags from very early game, since when lots of people talked about how op she was/is. I bought her frags whenever she's available. I only got her a month ago. Never regretted it :)
Or you can try

Mei / Kisame / Mabui. Play Kisame as tank he will be annoying af. He will heal 3 times from Mabui's chakra and 2 heals from Mabui and Azure.
This post was last edited by Petrichor

Another fun team to play.
Ok in pvp.

Mei / PB Sasuke / Mabui.

Single target cc. Mei will do extra dmg from PB's buff.

not exactly. if kisame can pull combo from his standard he will steal 20 chakra. that already stops their round 1 tenten's burst. or if it doens't work u can save ao and hold it for tenten.