If you're wondering: It's "Bean" because, even though he is Anti, he's different from the original idea of him. Anti is an ENTP, this powerful menace haunting the other egos, causing them harm and tormenting them. Bean, on the other hand, is an INFP, he cares about the others, he doesn't want to see them sad or hurt. He's emotional and sensitive, not an anger filled killer.
And I sometimes portray a closer to canon version of Anti too. That's just Anti, while Bean has his own name. They're two different beings.
In short: Anti - evil, Bean - misunderstood.