Freezie

Freezies (, Freezer), are enemies from the original  game.

Origin
Freezies, along with the Shellcreepers and the Sidesteppers, made their debut in  as "Slipice". They are ice creatures with simple eyes and a jagged frown.

Freezies emerge from the pipes on the upper portion of the stages, move from one side to the other, and then eventually covers one of them in ice, destroying itself in the process and making the platform extremely slippery. They can be defeated either by being hit from below or with the POW Block. Defeating Freezies is not required to clear a level; however, if the player comes into contact with one, they will lose a life.

In Super Smash Bros. Melee
The Freezie debuts as an item in Super Smash Bros. Melee.

When a Freezie appears, it slides across the stage on its own, speeding up if it encounters a slope. When picked up and thrown, any character hit by the Freezie will be frozen and knocked upwards. Freezies can break if attacked before being picked up. Freezies can KO characters at respectable percentages, as well as keeping characters trapped long enough to take considerable damage.

Despite their origin from the Super Mario series, Freezies appear as an item in the Icicle Mountain stage of Adventure Mode, which is based on the universe.

In Super Smash Bros. Brawl
The Freezie returns as an item.

Unlike in Melee, the Freezie's knockback and freeze time have been considerably reduced, and frozen characters fall much slower, making it harder to KO with. Freezies are also more difficult to destroy, and they may deal damage after they are destroyed to any player standing near them and can also freeze multiple foes at once. In addition, when used or shattered, it uses the sound effects taken from the Mario Bros. arcade game. If broken by a physical attack, the attacker will receive 2% damage and no knockback, but will flinch, interrupting whatever motion they're engaged in.

In Super Smash Bros. 4
The Freezie returns as an item.

Unlike in the previous games, instead of sliding off edges, the Freezies will turn around and move in the opposite direction, but it will still slide off slopes.

In Super Smash Bros. Ultimate
The Freezie returns as an item.

Unlike in the previous games, the Freezie deals noticeably less knockback on direct hit, lacking KO potential even at high percentage when thrown, although the splash hitbox retains its KO potential. The reduced knockback can result in improved followups, however.

Spirits
The Freezie also appears as a Novice-class support spirit.

In Adventure Mode: World of Light, the Freezie is presumably one of the countless spirits captured by Galeem during his takeover of the universe. The Freezie spirit is located in the icy mountain section of The Light Realm.

The Freezie's Spirit Battle uses the puppet fighter and is fought on the Mario Bros. stage's Battlefield form. During the battle, the Freezie appears as the item while the Ice Climbers start off with a Freezie.

In addition to the above, equipping the Mr. Frosty, Alolan Vulpix, or Hockey Players support spirits will give the player a Freezie at a start of their stock.