What do you think about guest characters in games, i.e. characters that don’t exist in that particular continuity but are added in as a bonus. In general I’m not crazy about the idea, but it can be cool in certain instances.
Here are some games where I didn’t feel like it added value
Soul Calibur 2 (Link in the CGN version, Spawn on XBox and Heihachi on PS2)
Mortal Kombat X (Jason, Predator)
I thought they were cool in the following games:
Shin Megami Tensei Nocturne (Dante)
Ninja Gaiden (Ayane)
Valkyria Chronicles (Vyse, Aika)
Super Smash Brothers (Sonic, Solid Snake)