From the Super Mario Wiki
Simon Belmont is a protagonist vampire hunter from Konami's Castlevania video game series, debuting in the very first entry to the series, Castlevania. He crosses over with characters from the Mario franchise in episodes of Captain N: The Game Master and again in Super Smash Bros. Ultimate. His descendant, Richter Belmont, also appears in Super Smash Bros. Ultimate as an Echo Fighter of Simon.
Captain N: The Game Master
Simon Belmont is a recurring character in the television series Captain N: The Game Master. In the series, he resides in Videoland (specifically the location Castlevania), and is a member of the N Team. In the pilot episode, "Kevin in Videoland", Simon helps the other heroes rescue Princess Lana, and they then battle Mother Brain and her allies throughout the show. A recurring gag in the series involved him frequently checking himself on a handheld mirror, and admiring himself. Andrew Kavadas portrayed him in the series.
Super Smash Bros. Ultimate
Simon makes his Super Smash Bros. debut in Super Smash Bros. Ultimate as a third-party playable character, alongside fellow Konami characters Solid Snake and Richter Belmont. He was announced to be playable in the game during the August 2018 Super Smash Bros. Ultimate Direct, alongside fellow newcomers Richter, Chrom, Dark Samus, and King K. Rool.
Simon's various attacks involve him using his "Vampire Killer" whip. His special attacks are Axe, an axe that is a powerful projectile; Holy Water, a magical, multi-hitting projectile dealing flame damage; Cross, a projectile with boomerang-esque properties; and Uppercut, a powerful uppercut that functions as Simon's recovery move. His Final Smash, Grand Cross, involves trapping players in a coffin and destroying it. Simon's whip is long-ranged, being effective to use from far distances. Simon's forward, back, and up aerials also function as tether recoveries, making them useful for recovering when close to an edge.
Keith Silverstein, Simon's English voice actor in Castlevania: Judgment reprises his role as Simon. Hideo Ishikawa, who voiced Simon in DreamMix TV World Fighters, also reprises the role in the Japanese version.
In his debut trailer, he arrives at Dracula's Castle and eliminates Death shortly after the latter killed Luigi. He later confronts Dracula himself but is nearly defeated, only to be saved by his descendant Richter.
Similar to King Dedede in Super Smash Bros. Brawl and Lucina in Super Smash Bros. for Nintendo 3DS / Wii U, Simon's name is announced differently in the Japanese version to reflect the pronunciation in that language. This trait is also shared with Richter and King K. Rool.
In the Adventure mode, Simon is seen standing near a cliff when he and the other fighters oppose Galeem for the first time. Although Simon is not shown to be hit by Galeem's beams directly, he, like every fighter except Kirby, is imprisoned in the World of Light, where a Galeem-serving puppet fighter of him is created. Simon is later freed after his puppet fighter is defeated, and he subsequently joins Kirby's team against Galeem and later Dharkon.
Simon is a heavy fighter, being heavier than Snake, R.O.B., and Banjo & Kazooie but lighter than Samus, Bowser Jr. (and the Koopalings), Dark Samus, and Terry, while having the same weight as Wario, Ike, Ridley, and Richter.
Classic Mode route
Axe is Simon's standard special move.
Cross is Simon's side special move.
Rising Uppercut is Simon's up special move.
Holy Water is Simon's down special move.
Grand Cross is Simon's Final Smash.
Super Smash Bros. Ultimate
Names in other languages