When dealing with interpersonal conflict, Rias prefers to avoid arguments, but if cornered will fight viciously and give no quarter. In physical confrontations, she is a reluctant but well versed fighter who while hesitating only does so for a split second. Given a choice, she will skip the small talk and go directly to a physical confrontation. This often results in scars, missing extremities like pieces of tail, horn, or what not from her opponent.

Rias Gremory’s most common emotional state is lust, which flares up but fades quickly; she doesn't currently know what real love is. Anger, like everyone has done her wrong in some manner even when they have done nothing. She enjoys summer thunderstorms in the darkest of nights, even more so if fog is involved. When she walks, it is of regal stature. Head held high, tail flinging about behind her as she refuses to be seen as weak. She prefers to fly more than walk, and can often be seen soaring among the clouds.