Prince of Sablé
The Prince of Sablé (サブレ王国の王子, Prince of the Sablé Kingdom) is the main protagonist from the Japan-only game Kaeru no Tame ni Kane wa Naru (The Frog For Whom the Bell Tolls).
In Kaeru no Tame ni Kane wa Naru, the naïve but well-meaning Prince of the Sablé Kingdom sets out to rescue Princess Tiramisu of the Mille-Feuille Kingdom after she is kidnapped by Lord Delarin. He was raised in a wealthy family, and as such, he often solves problems by buying his way out of them. On his quest, he competes with his friendly rival, Prince Richard of the Custard Kingdom.
Both princes are tricked into drinking a strange potion by the witch Mandola, which causes them to turn into frogs after touching cold water. The Prince of Sablé pays an exorbitant sum for an antidote and gains the ability to turn back into a human by fainting (which can be achieved by eating Joy Fruit), or into a snake by eating snake eggs. In Super Smash Bros., he can change between forms at will, though he will automatically become a frog if he touches water, referencing this scenario.
Combat in Kaeru no Tame ni Kane wa Naru is represented through a turn-based system that pits the player and their enemy in a battle within a dust cloud, exchanging hits until one is defeated. This is also referenced in Smash, as the Prince of Sablé will trap opponents in dust clouds where they gradually accumulate damage.
The Prince appears under the romanization "Sabure Prince" as a sticker.
As an Assist Trophy
The Prince of Sablé appears as an Assist Trophy and can transform into his frog or snake forms and trap opponents in dust clouds dealing up to 25% damage. As a frog, he jumps about the stage in large arcs, and as a snake, he slithers back and forth along platforms, sometimes falling off of them. He speaks Japanese in all versions of the game, and occasionally announces which form he will transform into: カエル for "frog", and ヘビ for "snake". Before he disappears, he will say さらばだ, translating to "Farewell". He is one of the few Assist Trophies that can be attacked.
As an Assist Trophy
The Prince of Sablé returns as an Assist Trophy, functioning similarly to how he did in Smash 4, but has been slightly nerfed overall. The rapid smoke attack has a smaller hitbox, as does the final attack, and the finishing attack deals slightly less knockback. KOing him now earns a point. He is also a Legend spirit and can be obtained after enhancing the Frog & Snake spirit.