
They later went and made a real MOBA out of it, named Heroes of the Storm featuring everyone from A-listers like Arthas to old classics like the Lost Vikings and key RTS units like the the Protoss Probe, here named Probius.
Blizzard Entertainment parodied this in their 2014 April Fool's prank Blizzard Outcasts, which casts various minor characters, units and mooks from their various series. Later updates would include characters from Arcana Heart, Senran Kagura and Akatsuki Blitzkampf. RWBY sticks out as the overall guest franchise, though it also fits in a sense as the creators of the two franchises (Toshimichi Mori and Monty Oum) were each fans of each others' work. The first three had some involvement by Arc System Works, though BlazBlue was the only one fully created by them Persona 4 is an RPG by Atlus that ArcSys developed the fighting game spin-off Arena for, while Under Night In-Birth was developed by French Bread and published by ArcSys in Japan. BlazBlue: Cross Tag Battle is combination of four franchises: BlazBlue, Persona 4: Arena, Under Night In-Birth, and RWBY.
Blade Strangers is a 2D fighting game for the Nintendo Switch featuring characters from various indie games such as Cave Story, The Binding of Isaac, Umihara Kawase, Code of Princess, Shovel Knight and Azure Striker Gunvolt, with later updates adding characters from 1001 Spikes and Doki Doki Poyacchio.
See also Platform Fighter, as since the most successful and popular mascot fighting game series is Super Smash Bros., many mascot fighters also tend to be within that sub-genre. Compare Mascot Racer, which as the title implies, is the same thing applied to racing games.