Cumber's title as an "Evil Saiyan" is derived from the fact that his ki can make other Saiyans go berserk if they touch it. This seems to only work on fullblooded Saiyans, as it was ineffective on Trunks. Additionally, he later allies with Son Goku and his friends alongside Hearts. The manga for Dragon Ball Heroes implies that he may have killed a god, but this has yet to be elaborated on.