I had this headcanon for a while that Seismic's body is at least partly hollow to carry minerals or other important sensible stuff. I also like that he's a typical big strong guy but has a lot of movement and speed in his moveset by ramming and jumping.
So imagine if he could put specific ores in his system to activate different effects, like magnetic metals, piezoelectric crystals, coal or magma for fire or just stuff himself with steel to get twice as heavy. Might overlap a bit with Beck's multiple form gimmick but could be a good one-off story where we get to see Mic be an earth robot more than a big muscle robot.
Those are goods hcs about Seismic!!












