Two of the characters from Crystalis are subtle nods to earlier SNK characters who later became part of The King of Fighters series; the latter two sages, Kensu and Asina, are based on Kensou Sie and Athena Asamiya from the Psycho Soldier arcade game.
It is made in style of other fighting games such as Street Fighter, Art of Fighting, Darkstalkers and even The King of Fighters, of game companies like Capcom and SNK.
In addition to previous established fighting game stars Terry Bogard and Ryo Sakazaki, the game introduces a new hero: a young Japanese martial artist named Kyo Kusanagi, who serves as the lead character in the early KOF games.
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A manhua adaptation of KOF titled The King of Fighters: Zillion was created by Andy Seto.
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The producer of the Maximum Impact series, Falcoon, stated that the Maximum Impact games are in a different continuity from the original series of games.
For most characters, this consists of fighting six characters, with Duke's cronie / Consigliere Hyena announcing the next opponent between matches.
Stephen King | King's College London | King Arthur | King | Nat King Cole | Burger King | B.B. King | The Lion King | King Lear | Martin Luther King, Jr. | King Edward VII | King Crimson | Larry King Live | King of the Hill | king | Larry King | Foo Fighters | King's College, Cambridge | King Kong | King's College | Martin Luther King | London King's Cross railway station | Carole King | King Edward's School, Birmingham | William Lyon Mackenzie King | The King and I | Martin Luther King Jr. | King's Lynn | The King of Queens | High King of Ireland |
It was the first fighting game by SNK to feature the character designs of former illustrator Shinkiro, who would go on to do the character designs for the later Fatal Fury and The King of Fighters games.
K' also appears in the manhua adaptation of The King of Fighters: Zillion that was created by Andy Seto.