[Shujin]

I believe serval skills that should be labeld as movement skills are not properly labed and I assume its an oversight. so those skills are uneffected by Immobilize/Frozen and given their great mobillity, I doubt that was intended.

Summoner:
Jhunn-Jetwing (given its great mobillity I assume its unintended)

Firebird:
Falcon Strike
Riser? (probably fine though)

Racial/Item: (I feel those shouldn't work either, espicially not when you are a fat block of ice)
Gain Air
Burn Up
Leaping Lizard


A skill that is hindered by Immobility though it shouldn't is:
Firebird:
Pierce Linker (Its not a movement skill, it attacks in a straight line, It also gives Mirage walk.)


All skills are tested with Frozen only, since I lack the tools to test it reasonably with Immobilize. If anyone noticed any other skills that are unjustifiedly stopped by Frozen (like Pierce Linker) or isn't stopped by it, feel free to add it here.