if the word protagonist comes from the words protos(first) and agonistes(actor) then the words tagonising and tagonist would mean to act when derived from the words protagonist and antagonist.
W: wow i'm tagonising in a positive manner, i must be the protagonist.
L: hey, i'm being an asshole about my tagonising, that must make me an antagonist.
Mid: I'm just doing my tagonising in a manner not associated with morality or a meta plot, I must just be a tagonist.