Two Things About Senna's Kit The ULT and E.

Off the back I can see only two things that I fine might be a MAJOR problem with this champion. The ULT and the E. Playing as Senna is going to be fun with this kit but playing against it she is going to be a nightmare.

Senna's ULT shouldn't have that type of range. I can see maybe having a Jhin or Lux range on the ULT but the way it is now just is overpowered. Senna is a SUPPORT marksman. A SUPPORT shouldn't have that range on a life saving UILT and damage ULT. If she was just providing a shield then that would be ok with that range, but the fact that she is damaging enemies, providing a shield to a ally, and with that range . . . . it's just overloaded. The ULT should have a Jhin and Lux ULT range and not that range where she can just shoot it from botlane all the way to top. I don't think that is very fair or balanced to play against.

The E is going to be the biggest problem and not for the reasons you think. Having the ability to provide movement speed and camouflage is not going to be the problem with Senna's E. Making allies untargetable/not clickable is going to be the part that seems unfair to play against. I think a healthy compromise would be instead allowing a few seconds of camo/movement speed boost after a ally leaves and that's it.