Lmao just know I'm brainrotted and am mentally making both my Xatts Anthros but more animal aligned than anthro Xatts cause Xep is based on a hare in my mind so I wanna turn her into a gangly limbed uncanny hare freak (lovingly) with stupid big ears who just generally has major something is very very wrong with her vibes and probably delights in torture and maiming like a little freak and would growl at Hayden ears pinned back in aggression showing, sharp back teeth that definitely probably shouldnt be there if he looked at the rabbit Xatt anthro too long.
Meanwhile sweet bun Xatt is stuck with this terrifying lanky maniac and is just shaped smaller squishy and ever so soft and fluffy with such delicate gentle paws and a light step. And Xep just wants to dress her up and admire her prize. But also probably has something a bit wrong with her as well. What exactly idk but probably don't get caught snooping somewhere you shouldn't by her. Cause I like the oh a cute lil lady <3 - oh there's something wrong with her actually. Maybe magic idk like I like the idea of powers especially darker magic making her perhaps just as deadly as the maniac hare.
Cause both being Xatts they're both dangerous just in slightly different ways bun is a cutesy lure with the unexpected jaw while Xep is cunning and moreso hunts and I think that'd translate over making them both deadly in different ways. They probably have some sort of work deal pact, not sure what or why I like them being in a fucked up partnership cause dynamic. Bound by blood. I'm just so brain rotted and so normal about this XD with so many mental images of art I'll never make but oof I wanna. I just thought you had a right to know your hayden world stuff urg it consumes me I love thinking about it its so fun.
Also I just like uncanny Valley hare lanky wrong and unnerving paired with a small fluffy and trustworthy bunny rabbit. Like the brain is vibrating at mental imagery of that the opposites the cute correct adored and the terrifying incorrect feared, always kind of bound to the other inseparable almost. Idk I can't fully explain it but thoughts go BRRR
In regards to the designs, any proportions you wanna draw them with are totally fine! You can draw 'em anthro with human proportions and clothing, you can draw them quad, you can draw 'em like Bugs Bunny and anything in between. Xatts can come in many shapes and sizes! A long gangly uncanny one sounds cool.
Also, having something "wrong" with 'em and a slightly ominous streak is very much in character for Xatts...they tend to be a little odd and feral at the best of times--it's mostly a matter of what their individual "bad" percentage is and how good they are at controlling it.
Also, your description of your two as a tag team sounds very endearing! I'll keep that in mind when I do your Xatt sketches… (still planning that, just catching up on stuff and in a bit of a digital art slump at the moment)
In regards to Hyden's reaction, I can certainly say he'd be rather creeped out by a Xatt. Once the surprise wore off, though, he'd be fascinated by this strange, new, potentially magical creature… careful, Xep, don't let him get you on the dissection table!
In the current version of the Amaranthine story, Xatts aren't canonically present--they're more of a free-floating monster idea that could be plugged into any setting--but they were originally part of Amaranthine back in 2009.
In the original 2009-era backstory for Xatts, they were born from the Shadow. Given that Hyden was the one who released the Shadow upon the world in the first place, that would have made him their accidental "father", in a way.
The connection between the two isn't canon anymore, but just a fun little bit of trivia. :)