So yeah, as you probably noticed there was a big ol’ Grimmbaby giveaway, and i managed to lay my cursed grabbers on this lovely bean! Their name is Navy, and they are a Grimmchild in it’s uhh final(?) form, the one after the ritual is complete.
In a town somewhere on the way to Hallownest the Grimm Troupe was apparently summoned and the ritual took place, but after it was done, the Grimmchild charm was abandoned in one of the houses. Long time later Wren (along with Erasmus which you can’t really see here) will stumble their way through the town, and probably through various houses to see if there is anything valuable in this dead place. They find this charm and nothing more. After they leave, they try the charm on to see what it does, and for the next five minutes they’re running around screaming at the bat bug child to scram lel. Of course Wren immidiately forgets that this charm exists, so they dont exactly realise they can just take it off, though by the time they do find out they’re already used to this tiny jerk. Cuz let’s face it - they are a jerk. Not the bully kind of jerk, but they don’t exactly get along with Wren. At first at least. They follow them around mostly for food. Which, in my mind, would be Wren’s nightmare fuel: all the bad emotions like fear, self loathing and this kinda stuff, that causes Wren to have nightmares. Navy will feed off of that, leaving Wren feeling slightly better than usual - hence the “an actual cure for depression” phrase lmao. Of course this doesn’t last long, Wren is a factory of this kind of thing, that’s why Navy decides to stay with them instead of just leaving, which i think they can totally do, in my opinion all the charm does is summon them into existance, and what they will do during this existance is a whole other thing.
After they get fed enough they will grow up to look similar to Grimm, no suprise here i bet. They will be taller than Wren for a good while, that is until Wren grows up themselves. I think it’s worth mentioning that Wren and Erasm have no clue of what Grimm Troupe is, but once Navy is all grown and starts to talk, maybe they will figure it out. Navy can talk as an adult, but chooses not to, they’re pretty quiet. If they ever open their mouth it’s to either roast you figuratively or literally.
Also i feel like i need to point this out: Navy spends most of the time resting / sleeping on Wren’s shoulders, at first simply to annoy them, later because its comfortable.