As far as we know there’s 4 different blue trims (there may be more).
Cytharam/Elytra blue trim, he was the one that fought Wemmbu in the final duel, he also sometimes gets the Mace in order to take advantage of his elytra macing skills.
Redstone blue trim, he was the one that created the railgun used to pop Wemmbu in the intro, he was also the first Blue trim to appear in the video before teleporting away with the stasis, he is probably also the one to make the sky transportation machine and all the stasis that they all use.
Mace blue trim, the second one to appear in the video ambushing Wemmbu and popping him, he is the one that wields the mace, even though he has such a powerful weapon, he is completely outclassed by Wemmbu’s elytra mace.
Cart blue trim, he was the one that appeared in Dizzy’s base, his main combat style is crossbow carting, and he was also the third one to appear at the start of the video, he was the one that appeared with the underground cart trap, but he quickly retreated after finding that it’s futile to fight Wemmbu with full gear.