Clichés in Video Games you love.

[JiraiyaSennin]

I like a cliche were one of your friends/allies/etc becomes a boss of the game.

Example: Syphon Filter 2's final boss.

I also like the opposite of this, where a previous boss becomes your ally.

I think it happened in Sly Cooper 3 where King Panda came back to help Sly and his gang.