Batman:Arkham Asylum 
 Please stop adding trivia to numerous articles. Wikipedia is not a game guide, and doesn't exist to put in information on how to beat game bosses. Further, a name on a list is not a character cameo. It's just writing to the setting, or at the most generous, a trivial easter egg. The number of such 'easter eggs' can be addressed on the article about the game, we don't index every time a character is named anywhere any time.