Frosta

Frosta rules the Kingdom of Snows, and the Filmation series writes her like a working head of state rather than a sidekick waiting on She-Ra to arrive. She is blunt with allies and enemies alike, quick to lose patience with ceremony, and just as quick to act on her own authority when a situation calls for it. Her power is plain enough to state in a sentence: she can freeze water and snow into ice at will, shape it into weapons, shields or climbable spikes, and raise a blizzard when the moment demands one.

That self-sufficiency is the throughline across her confirmed appearances. She shows up at Mystacor's trickster competition in "Three Courageous Hearts," stands with the gathered Rebellion against Shadow Weaver and Catra in "Into the Dark Dimension," and raises an ice wall against Hordak's Monstroids alongside Snout Spout in "Day of the Flowers." In every one of them she is doing something, not waiting for someone else to.

Clipped from our own copy of He-Man and the Masters of the Universe, Black Snow (She-Ra: Princess of Power, 1985), 2:00 to 3:56, 1 minute 56 seconds. Nothing is added and nothing is sped up. Copyright Mattel.

"Black Snow" is the one episode built around Frosta. She calls She-Ra to the Kingdom of Snows over black snow falling on the neighboring Selkies' land of Galacia, a Horde scheme dressed up as a quarrel between two kingdoms with an old, uneasy truce. The Selkie chief Narwhal blames the Snow People outright, and despite Frosta's warning that "no good ruler wants war," he has her taken prisoner anyway while his officer marches the army out in answer.

She does not wait to be rescued. While She-Ra is off chasing the real culprit, Modulok, through his flying Weather Wheel, Frosta freezes a rush of water into spikes on the wall of her cell and climbs out under her own power. She reaches the two armies just as they are about to meet, halts the fighting with her ice, and gets an apology out of Narwhal directly.