Ruusha is a succubus, which means that she has large assets. However, in the game there are two female character-specific evilities (passive skills) that affect characters based on their bust size: "Bodacious Bulwark" (buffs defence for busty characters) and "Too Flat to Hit" (buffs evasion for flat-chested characters). Ruusha gets buffs from both at the same time.