She befriends Valkyrie/Stephanie in Book 1. During a conversation with Valkyrie, Tanith expresses a desire for a little sister and she and Valkyrie develop an affectionate sisterly relationship. Valkyrie refers to Tanith as being like a sister to her in the fourth book. Tanith is also known to have an elder brother whom she states she 'loves to death'. Despite her softer, warmer side, Tanith can be ruthless, sending two Cleavers to their death in order to distract some Hollow Men to rescue Skulduggery from Serpine. She is also an excellent fighter. She takes on Serpine's White Cleaver in combat at the end of the first book, and almost wins, but the White Cleaver throws his scythe through her back and she nearly dies.