Mr. Blizzard

From the Super Mario Wiki

Mr. Blizzards are snowmen that jump up and down and can throw snowballs in Super Mario 64 (And Super Mario 64 DS). They can be defeated by running around them, just like Mr. Is can be defeated.

They also appear in Mario Pinball Land, Dance Dance Revolution: Mario Mix, the Mario Kart series and the Mario Party series.

It is possible that they're related to the Dr. Freezegoods of Super Mario World 2: Yoshi's Island. Also, a Super Mario 64 character known as Headless Snowman resembles them.

Mr. Blizzards have made a recent appearance as items in the Mario Party series in Mario Party 5, Mario Party 6, and Mario Party 7. In each game, if their space is triggered, the player who triggered it will lose all of their items.

Ice Creatures
Abominable Snowkoopa | Baron Brrr | Beldam | Bleak | Blizzaurus | Bonechill | Brrr Bit | Chief Chilly | Chill Bully | Crystal Bit | Crystal King | Dr. Freezegood | Flaky | Flurry | Freezie | Frost Piranha | Headless Snowman | Ice Elemental Ghost | Ice Puff | Ice Spiny | Jojora | Jojora's Friends | Mr. Blizzard | Penguin | Penguin (WL) | Topi

Super Mario 64 (DS) Characters
Mario | Luigi | Wario | Yoshi | Bubba | Dorrie | Fwoosh | Headless Snowman | Hoot the Owl | Klepto | Koopa the Quick | Manta | MIPS | Peach | Sushi | Tuxie | Unagi the Eel
Super Mario 64 (DS) Bosses
Big Bob-omb | Big Bully | Big Mr. I | Bowser | Chief Chilly | Chill Bully | Eyerok | Goomboss | King Boo | Whomp King
Super Mario 64 (DS) Species
Amp | Bob-omb | Big Boo | Bob-omb Buddy | Bully | Boo | Bookend | Bub | Bullet Bill | Chain Chomp | Cheep-Cheep | Chuckya | Fly Guy | Goomba | Grand Goomba | Grindel | Heave Ho | Koopa Troopa | Lakitu | Mad Piano | Micro-Goomba | Moneybags | Monty Mole | Mr. Blizzard | Mr. I | Penguin | Piranha Plant | Pokey | Scuttle Bug | Skeeter | Snufit | Spindel | Spindrift | Spiny | Swooper | Thwomp | Toad | Tox Box | Tweester | Ukiki | Whomp | Wiggler