He eventually gets better at it, it just takes him a while to get there. One knows mystics and is good at some mystic stuff, so is gonna be specially frustraiting not to be able to control the odashi, Draxum's expectations on him don't really help. but he'll get there!! I do have a few episodes planned that tackle all of these
He doesnt really care about most of the scars, if asked, he's more likely to just shrugg it off and say they are from training or from a mission (not a lie)
there's just a couple of them that would get him excited to actually talk about (some on his shell) and I had thought to make a short comic on it, but it's been a while since I started this au and I've got so liitle out and so much of the story to tell so it's been discarted for now
When it comes specificaly to the ones from the vines, he would never in a million years admit what had happened. everyone is 100% on the dark on how he got them until the event I've dubbed Vine 2: Electric Boogaloo (more here) and even then, he would want and wont talk about them
when it comes to the others reaction those are part of the story I want to keep to myself until I can draw that part and tell the story properly, I believe I've talked about it a little bit before, you can scroll down the #slau seed tag on the askblog to look for more things
Shredder stuff pretty much happens the same as canon, there's just a bit of a side quest going on too with Mikey trying to get Draxum and One to actually bond and get along
1- not really, at least not conciously, but I've realized a few paralells between him and other characters I like, I've never considered the Zuko vibes but I've got a few people mentioned the Hunter vibes, and with that I can agree to (1 / 2 / halloween edition/ theres also a few drawings I've made joking about it but I cant find them rn, I'll post them later... probably)
On a side note, I was watching lilo and stitch and One also has a lot of Stitch vibes if we go for the more gremlin and destructive side of him and I think thats really funny, is also not the first time I've thought about that
2- Splinter knew he existed in the "I know there were 4 turltes" when the whole mutation stuff happened, but as far as he knows at some point while running away he must had dropped one turtle and didnt noticed until it was too late and he couldnt go back for him. He saw the lab explode, so all the time he has thought that turtle died
they actually meet each other after the events of Shadow of Evil, but they have seen each other a couple of times before, one time is a made up episode I have planned and the other is piggybacking on The Fast and the Furriest, being the very first time they see each other, tho is for a very short time as One is already leaving
I dont wanna talk about it much, as I like more when a story tells itself, but Splinter at this point knows his sons have been hangin out with a new friend and that fried is from the Hidden City, they had just balantly hidden the part about knowing Draxum made them and also made this other guy at the same time, but Splinter does recognize One and later the others have to explain on how they know him and what exaclty they know
One doesnt really care about Splinter, he's just this random mutant/yokai that adopted the other experiments and is an obstacle on his mission to get them to join Draxum. One know their dad doesnt like him, cause he thinks One's being a bad infuence on his sons (and One thinks thats funny), One also knows he's the one who thought them to fight, but thats pretty much it