>>546115210
Mei can only be lightning and not like Luna's anywhere near relevant nowadays when almost all her niches are taken away already (bleed, hitcount) by Sushang plus her weathers never showed up since forever.
I'm guessing she's psy or bio but Helia is too recent to already be contested. I guess qua/img/std isn't out of the picture yet since they seem to be on crack when deciding types sometimes (mech Mobius and Cora/bio Helia lol).
Her being given away could also mean a divine key in the future though.