Atlus

Atlus (, Atlus Corporation) is a Japanese video game developer, publisher and distributer. The company was founded on April 7th, 1986 as a development studio for other companies. One of their early successes was a partnership with Namco in 1987 to release , a video game adaptation of the OVA of the same name, itself based on the series of novels of the same name. Atlus would also start self-publishing their own games with  in 1989. Atlus also had an investment in the arcade industry, forming a working relationship with Sega in 1995 to distribute the brand of photo booths. Atlus would acquire several other companies through the 1990's, but would accrue debt that would lead to a financial deficit by 2000.

Toy company would acquire Atlus in October of 2003, only to sell them to technology firm  on October 30th, 2006. On August 30th, 2010, Index announced that it would fully fold Atlus into the Index brand and retire the name, officially killing off the original Atlus. This Index era lasted until 2013 when Index went bankrupt, and Sega would acquire the company on September 18th of that year. The company was folded into Sega Dream Corporation, which was promptly renamed to Index Corporation. In 2014, Sega split Index into two different entities. One would be the technology assets which were named Index Corporation, which were sold off to Sawada Holdings in 2015 and was officially renamed iXIT Corporation in 2016. The remaining assets and video game division of the old Index Corporation were renamed Atlus Co. Ltd. This new Atlus has been a subsidiary of Sega ever since, and have been responsible for developing the ',, ', and ' series, as well as other games like ', ' and '.

In Super Smash Bros. Ultimate
Tsubasa Oribe from the and ' crossover title ' appears as a spirit, which can be enhanced into her Carnage form.

, the main protagonist of , was announced as the first DLC newcomer, as part of Challenger Pack 1 in that case, for Ultimate at. He was later added in, along with Mementos, multiple spirits, and multiple music tracks from the series on April 17th, 2019. Additionally, multiple Persona Mii Costumes were released at the same time, including Morgana and Teddie as Mii Fighter hats, and both the Protagonist from ' and the Protagonist from ' for the. Sophia from  appeared later as a gifted spirit on March 4th, 2021 if a player has a save of the game on their Nintendo Switch.

Trivia

 * Atlus is the second third-party company to be introduced to the Super Smash Bros. series as DLC, the first being Square Enix.
 * Despite being featured in Smash 4 as a developer of, PlatinumGames was not formally introduced as a third-party company with playable characters even with the last DLC of Smash 4 with Bayonetta. The reason might be because PlatinumGames doesn't own the IP, unlike how Atlus was originally an independent company who created, developed and published the Persona series years before being bought by Sega.