Variant suggestion: Ultima

The game of Ultima is one of the most popular variants, invented by Robert Abbott in 1963. It's an extremely unconventional variant leading to gameplay drastically different from chess. It would be really nice to see this supported on Chess.com.

The general concept of Ultima is that all non-king pieces move like queens (or rooks in the case of pawns), but are differentiated only in how they capture. Pawns capture by sandwiching an enemy piece in between friendly pieces; long leapers capture by leaping over possibly multiple enemy pieces; withdrawers capture by retreating from enemy pieces; coordinators capture pieces in the vertices of a square made with the king; immobilisers do not capture but rather freeze adjacent pieces; and chameleons capture by imitating the capturing style of the piece being captured.

too different from chess to be a "chess variant" don't you think

I do actually agree with you - it's more of its own game rather than a variant of chess. However it would still be nice to have this be playable on chess.com, considering that it's already possible to play things like four-player fog of war duck chess.

I haven't seen a 4P FoW game in a while lol

Duck Chess is basically regular chess with a few "extra" rules

This one seems really complicated to learn, and the fact that you would have to change, not add new game rules and piece movements would make this a nightmare to code in.

It's a cool idea tho