Spartan David is an SPARTAN-II commando and an major character in the Super Smash Bros. Crossover. He is the original leader of the Spartan Squad and the first ever spartan in the UNSC. He led the Spartan Squad to battle and win over the Forerunners led by The Didact in the Spartan-Forerunner War, whom were attempting to take over Vestroia as their homeland. He first appeared in Season 9 as an illusion towards the characters whom in the future will become the future Heroes Of Legend. He made his first physical appearance in Season 24, when saves Tikal The Echidna from Ultron and he along with Master Chief and Tikal The Echidna stopped High Charity from reaching Mobius and escaped
30 years before the main events of Super Smash Bros. Crossover. When Dr Hasley was the creator of the SPARTAN program, Spartan David became one of the first spartans when he requested to be equip and test the armor by training. Dr Halsey accepted the request and the test of Spartan David's armor was successful. Later he discovered that The Didact had wanted to conquer and colonize Vestroia by wiping out the bakugan. Spartan David prohibited this to happen and formed his team unit known as the Spartan Squad. Despite facing various difficulties with the The Didact's experiments such as The Flood or his Promethean Knights. The Spartan Squad emerged victorious thanks to The Librarian who was Ur-Didact's wife stopped him from using the Composer as this posed an threat of extinction towards the bakugan. In Season 9, Spartan David appeared in the dreams of Master Chief, Tikal The Echidna, Sonic The Hedgehog, Goku, Mario, Kirby, Naruto Uzumaki, Shadow The Hedgehog. He tells them that they are the chosen ones to become an new team known as the Heroes Of Legend to be able to destroy the mechtogan Coredegon and defeat the powerful Forerunners. Spartan David physically appeared in Season 24, where he began investigating High Charity approaching Angel Island in Mobius, an convenant ship now infested with Flood. As he entered the ship he saves Tikal The Echidna from being killed by Ultron. Ultron attempted to prevent them from escaping but was fought off by Captain America. He and Master Chief shut down the ship from approaching Angel Island and escape.
Spartan David resembles the spartan from Halo: Spartan Strike.