You'll get a brief description of each character, also.
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Harpy is the quirky, singing angel that troubles Arle Nadja in all of the Puyo/Madou Monogatari games. She sings annoying songs to bother Arle and Carbuncle, and Arle always challenges her to a game of PuyoPuyo. She sings well in the game and poorly in the anime ^_^;;
Satan is the main evil dude of the Puyo and Madou Monogatari series. His villinous deeds usually are trapping Arle into going on a date with him, although it's Rulue who really wants to date him! He seems to be more in love with Carbuncle than Arle sometimes ^_^