[Snake]

Yep, Immobilize could use a buff since it's considered to be a 'rare' skill, but in some special cases it's not needed, such as:

Blink, Swap Position and Voidgates are magical in a way, you warp in the void, your body phases out of existence and then back. Same to Lich's passive movement teleport. Same to Phase Python's skills. So those would be immune to immobilize, yeah.

So yeah, I agree with everything listed above by Shujin with my exceptions.


PS: But asking for realism at this point is the same as asking for (tl;dr, the impossible.) Felidaes to be immune to knockdowns because cats, Or Liches to return any fist-based basic hit in Akashic magic damage because the hands are burning in contact with their Focus-made body, or even Oracles having 100% Evade/Hit at melee.