Alph (アルフ, Alph) is the first of the three protagonists of Pikmin 3. He was the engineer on the S.S. Drake as well as the youngest crew member. After getting stranded on PNF-404, the world of Pikmin, it fell to him to reunite the crew, get the fruit they were sent to obtain, and repair the ship's warp drive. The crew end up running into and saving Olimar in the end.
In Pikmin 3, a group of three astronauts consisting of Alph, Brittany and Charlie, are tasked with saving their home planet of Koppai, due to their planet's food supplies become nearly depleted. When data collected reveals that a distant planet, given the name PNF-404 (which also happens to be the home planet of the Pikmin), is rich with a variety of fruits whose seeds can be cultivated on Koppai to end the food shortage, the crew of three travel to the alien planet in the S.S. Drake.
However, their ship malfunctions and they become separated just before landing, with the cosmic-drive key also being lost, which is mandatory for leaving the planet. Over the course of the game, Alph reunites with Brittany and Charlie, collects fruit, harvesting their seeds and using their juice for sustenance while on the planet, and eventually meets up with Louie and later on Olimar, who they rescue from the Plasm Wraith. As thanks, Olimar gives them their lost cosmic-drive key, allowing them to return to Koppai safely with their findings.
As a playable character
Main article: Olimar (SSB4)
Four of Olimar's alternate costumes replace his model with Alph, making him an alternate form of a playable character. He has his own alternate costumes as well, which are based on the color schemes of Brittany, Charlie, and Olimar. Despite using a different spaceship, the S.S. Drake, in Pikmin 3, Alph still uses Olimar's Hocotate Ship for his on-screen appearance and Final Smash. He has a trophy using his playable model, classified under the fighters category. However, it is obtained in the Trophy Shop instead of as a reward for clearing Classic Mode, similarly to the Koopalings.
According to design documents for the game available in Masahiro Sakurai's book "Thinking of the Making of Video Games 2" (桜井政博のゲームを作って思うこと2), Alph was planned to be included as a clone alongside Lucina, Dr. Mario, and Dark Pit, instead of just being an alternate costume for Olimar. Rock Pikmin were additionally planned to be included, in which they would be heavy and short-ranged, but very powerful, similarly to Purple Pikmin. However, neither idea ended up implemented in the final release, presumably because of time constraints.
As a playable character
Main article: Olimar (SSBU)
In Super Smash Bros. Ultimate, Alph returns as a playable character accessible via Olimar's alternate costumes. Unlike in the previous game, Alph is now an 'unlockable character' (due to Olimar himself needing to be unlocked in this game). Once again, his attacks and statistics are identical to Olimar's and (with the exception of the announcer, crowd, and character selection, all of which say and/or display his own name) the game does not acknowledge him as a separate character from Olimar in battle records and other miscellaneous aspects, such as Classic Mode. Akin to his trophy in Super Smash Bros. 4, Alph also has his own associated Fighter Spirit, although it can only be obtained from the Shop instead of being rewarded after completing Classic Mode.