Jack Frost:
Not to be confused with Jack Q. Frost:
Or Dr. Frost:
Whether any of these characters is - or ever were - really “needed” is highly debatable.
Terminator from Rom:Spaceknight had “blacklight eyebeams” of force or extreme cold.
One of the ways they tried to get [del]Aqualad[/del] Tempest out from Aquaman’s shadow was by giving the guy power over water: sometimes that would involve a trick with steam, but the easy go-to move was showing him doing ‘ice’ stuff.
How about the Oglaf Snow Queen?
The recruitment pitch might be different.
Walter White :eek:
Joe Satriani 
:D:D
I’ve got a few actual comic book examples:
-DC’s short-lived 90’s title Young Heroes In Love had Frostbite in it’s ensemble cast.
-Super-hero role-playing games almost always had ice/cold heroes or villains among the sample characters. The Champions RPG was popular enough in the 80s to launch a comic book series based the Champions super-team characters from the game, which included Icestar (and, later, his kid sister Icicle.)
-Jack of Fables was a spinoff of the popular DC/Vertigo Fables series. In one of his adventures, he seduced the Snow Queen and stole her powers, becoming Jack Frost.
DJ Chill from Zenith.
Katara from Avatar (or any waterbender, really, but let’s go with her).
Rukia from Bleach (some other Soul Reapers also have ice powers, but let’s go with her)