Save Chan

Even though you have a "save" option in the menu that can be used anytime and anywhere (except the Sewers), Save-chan is a reocurring character that always appears just before a very important scene and/or bossfight, reminding you to save.

She never talks with any of the ingame characters, always refering to you as the player to save the game, breaking the fourth wall.

She also seems to know everything about saving and loading, since if four or more charcters die in your playthrough, she changes into Load-chan, asking you to load the game instead so you can save your friends.