Undoing a character delete is fairly trivial. The reason their is a prompt in most games is that their is no universally excepted way to undo something in games. It's become accepted to have a confirmation box.
As for consistency in a game, menus and the games UI rarely share the same structure. It's also generally except that you don't put up a confirmation box for the player to level up.
> The reason their is a prompt in most games is that their is no universally excepted way to undo something in games. It's become accepted to have a confirmation box.
Honestly, how many actions in a game does it make sense to undo, unless you're playing Prince of Persia: Sands of Time? I'm a big proponent of 'make everything undoable' but you are stretching it way beyond its use here.
As for consistency in a game, menus and the games UI rarely share the same structure. It's also generally except that you don't put up a confirmation box for the player to level up.