>Satania is a demon but nowhere near evil. She may be bad about thinking how to take down Gab but she will never try to harm her too much (However, Gab's counter-attack is far more brutal). Her innocence is also why her demonic mind is silly and child-like, doing pranks rather than evil things. As the series progress, it's revealed that Satania is also genuinely good like her friends. A loyal and caring friend (though her pride refuses to admit it), she truly cares to all of her friends including Gab, who she considers as her rival, to the point that she liked her company albeit the numerous petty fights they always have. She also values life highly, as she rushes immediately to rescue the dog from being taken to the pound and being put down before finally adopting him.
https://gabdro.fandom.com/wiki/Satanichia_Kurumizawa_Mcdowell