Ok, so I’m personally convinced that Marvus

and this guy

have Something going on together and that only one of them is an actual purple blood, while the other is a lime blood with the axolotl lusus.

I’ve previously expressed my theory that Marvus is secretly a lime blood with the sign Canra, prospit sway, mind bound.

But you know what sign is also that?

Nameless troll additionally has horns of an atypical shape for a purple blood, and not only that, but they’re painted, possibly to cover up unusual coloration, which doesn’t make much sense until you consider the another potential candidate for secret lime:

there’s a post floating around somewhere detailing the color differences in both her card and Horns, prompting the theory that her horns are fake, but what if lime bloods just have darker horns?

Anyway back on track with my theory, I think one of two possible scenarios applies.

1. Nameless troll is an orphan true purple blood that a lime blood Marvus moved in with along with his lusus which more or less looks after them both.

1. Nameless troll is a lime blood that Marvus handed his sign to and is actively hiding.