Update: I was unfortunately not aware of Shamus Young's severe criticism of Fallout 3 available here to link in the original piece and I regret that. It dovetails rather nicely with what I've written and it's much better executed than my piece. I strongly recommend anyone...
Code and effect are as follow:
new character sora and roxas :l l r - sora and roxas cloud leon
dbz characters r l - goku teen gohan trunks sord vegeta
crash bash characters x l r - crash coocoo nina crunch ben 10