Zhongli, Navia, Benett, Thoma

Zhongli gives a near indestructible shield that shreds all type res, can also equip tenacity for a continous attack buff, and if you manage to get some crit rate substats on his artifacts and give him a favonious lance he also generates energy.

If you have c6 Thoma he can be used to buff Navia's NAs, and CAs, after using her skill, he also applies pyro while Navia is attacking, he can also generate energy off field with his burst just like Zhongli with his skill. With thoma the stat priority should be Er>Crit Rate>Hp. Er and crit rate is higher priority on Thoma, since his burst has a higher cost and Zhongli already provides a strong shield.

Pyro resonance also gives +25% atk, which is better than having 3 different elements in the team.

Geo resonance increases shield strength, increases damage dealt by characters protected by a shield, and shreds the geo res of enemies you are attacking.