Tsukihime has a rare split personality condition rarely seen among the Hyūga clan, her other side identifies herself as Taiyōhime and has formed her own identity. Tsukihime puts up a serious front but occasionally shows traces of humour, mostly to those close to her who she trusts and respects. She rarely gets close to anyone straight away but approaches most people with neutrality until they prove themselves trustworthy and to be good allies and friends.