In an AU where Tiny somehow joins ThunderClan, I think that for a while they would keep his kittypet name. Then change it to some more positively-associated prefix, perhaps during his warrior's ceremony. Something like "Slight-", maybe. Slightpelt? His name could be Eeldash because he's fast as hell and slippery (because of his size, he'd be a bit difficult to catch for other larger warriors).
Hm... thinking how he'd join ThunderClan, perhaps he'd somehow evade Tigerpaw's attack until a point, when he's pinned down. Bluefur steps in and argues they should bring him home, since clearly he's not an ordinary kittypet. I don't think Thistleclaw would like that but Tigerpaw being still young and easily swayed might consider Bluefur's words for a bit. I'm not sure if he'd agree with her, though, but he'd probably stop and think. I'm not a fan of representing Tigerstar, at any point of his life, as a simplistic brute. He's very intelligent, and it is showcased throughout the first arc that his ascent to power is fairly strategic for a cat seemingly obsessed with violence. He prefers not to get his own claws dirty, you can tell this when he sics the dogs on the forest, forms an allyship with BloodClan, forms TigerClan, etc.. This is a post about TC!Scourge, though, not a discussion of Tigerstar's characterization.
I really do wonder how Tiny being a ThunderClan warrior would affect the narrative of the first arc. I'm sure Rusty joining the clan would be easier for him, but perhaps Tigerclaw and his clique are still doubtful. I think the fight with Longtail can still happen. It would be really nice for Rusty to have a role model in Tiny (from now on Eeldash), considering their similar background and probably similar treatment by the clan.
Eeldash would probably be a little jealous about Firepaw having a friend in the clan, since he didn't really have any when he was his age. I imagine him functioning a bit like a more "acccessible" Whitestorm, since he's probably interested in Firepaw, again, because of their shared background of being ex-kittypets. It's likely Bluestar would assign him to be Firepaw's mentor, especially after the devastating back to back loss of two deputies (Redtail and Lionheart). Though I wonder if she'd trust Eeldash with raising the fire that was prophesied to save ThunderClan, though. Perhaps she'd have him be Firepaw's official mentor, but often tag along to trainings to watch.
Eeldash is likely to have not had an apprentice until Firepaw, or maybe if he did his apprentices wouldn't quite respect him because of his stature and background.
More to come, probably, but I'm considering still. Additions welcome :)
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