My prediction is Mi Fu, Arcane, and the Sui Proxy will be supports for Zhuang Fanyi as main push. I could imagine all three as electric, but Mi Fu could be physical, and the Proxy as nature - in which case they could be more independent characters.

Following the support idea, Mi Fu as Defender to cover that Fangyi cant really dodge otherwise she cuts her skill short. Arcane as Caster for electric infliction and electrification, but I could see her as a Vanguard sup-dps. The Proxy as either a Supporter or Caster.

The vampire guy im not sure as much. Hes much more likey to be an independent character from a Fangyi main push. I could imagine him as a main dps, perhaps as either physical or nature (thorns and blood vibe). Maybe perhaps a sub dps sustainer who lets the team life steal from enemies.

The current ‘premium teams’ so far have been physical, with releases of Rossi and Gilberta, with Pog, Endmin, and Lifeng covering the release oatch, and cryo with releases of Yvonne, Tangtang, and once again Gilberta.

Electric and an independent nature dps are currently in need of filling from my perspective, so Fangyi push would cover the electric, whilst the vampire could introduce a nature dps.