Ninjas as a theme.
I like that the game has ninjas. I like that one of them can actually be a little stealthy (ignoring the fact her stealth is in a very small area and it is extremely obvious where she's standing, if inside it.)
I don't like that one of the Ninjas is a Naruto-style, no-stealth, flashy, LIGHTSHOW type.
I don't like that one of them is a tank who's only a ninja in terms of dress.
I don't like that the only one with the part I like has less stealth than
.
Two of them carry weapons that are so massive that there is literally nowhere in their clothing they could hide the weapons.

None of them can appear as an opponent, which would be more historically accurate than any of their abilities, and would be fun (as we saw with Trickster's Glass)
If anything, Shen should get that sort of ability if they're going to keep him as a tank. It would go well with a tank item set, as well as be historically accurate.
Just some thoughts on how not-at-all-like-ninjas these ninjas are.