This is what I'd go with based on your current ninjas.

Kisame is the main attacker. His attack and combo rate scale 3% for each chakra point you have over 40, and this team is pretty good at generating chakra (Kisame with his standard and mystery, Lightning main with his standard, and Mabui with her passive).

Mei is a secondary attacker. You can either use her in round 2 or save her until round 3. Her barrier also boosts her and Kisame's ninjutsu by 40%. She will also immobile whichever ninja you specifically targeted with Kisame's mystery if she chases, which is nice. I personally always like to have a chase that causes immobile, chaos, or acupuncture that follows from the main round 2 mystery.

Use Lightning main's mystery in round 1 to prevent opposing ninja from setting up their own barriers that would override Mei's. If the opponent doesn't have a barrier ninja, just use it to stop any other set up (like shields).

Mabui is there to give everyone shields at the beginning of the battle, give chakra, and to give some healing. Her mystery is pretty unimportant, but you can do it if you have some leftover chakra at the end of a round and you wanna hit someone with low health.

Hope this helps, good luck!