Some abilities should be changed
None of the Glacials should have stuns on top of their passive. That's part of what makes them overpowered. They should instead have:
her W, not her R.
the bonus damage from her E, not her OLD R. (extra damage to anyone stunned by a Glacial, not just herself) This could make it still worthwhile for her to be 4 cost.
her Q, not the weird conditional, nerfed version of her R.
As for others:
should have her Q, not a single-target R. Maybe have it slow AS since MS isn't a stat (like Anivia's does). OR if she must have a single-target stun, make it her E and have her slam the target to the edge.
is fine with his Q, but it should be the shape of his second Q, not the third. Or at least knock up the center target.
should have his passive, not his Q. It'd make him more unique, and more of a counter to other frontliners rather than just having a generic damage ability.