She thinks of Issei as a special person and always gets jealous when girls are around him, becoming a totally different person when she sees him and other girls together, or when it comes to training. Despite her mature stature like a woman, Rias tends to act her true age and becomes frustrated whenever girls flirt with Issei. While Rias is usually calm and mature in most situations, she loses her mature aura and presence when she sees any girl (especially Akeno) flirting with or seducing Issei.

On some rare occasions, Rias wears glasses when she's deep in thought, as she feels they make her mind work better despite having perfect eyesight. Rias' hobbies are reading, shopping, gardening, cooking, making handcraft and maquettes, and playing video games. [12] The reason why Rias has large breasts even at a young age is because it is a hereditary trait as her mother Venelana, grandmother Chysis and her ancestor Runeas also have large breasts. Master Designer: Rias is a brilliant interior designer, having designed the chic interior of Cafe CxC along with very elegant furniture. Rassei • Samael • Issei Hyoudou • Tannin • Bova Tannin • Blizzard Dragon • Sprite Dragon • Earth Dragon • Spectre DragonsOppai Beam (おっぱいビーム, Oppai Bīmu): Rias has gained the ability to project a red light from her breasts, which recharges Issei's energy. Each use of this power causes her breasts to temporarily shrink in size, however, her breast size will restore itself after a few days of rest. She is the first to become Issei's girlfriend, as well as becoming the first to become engaged to him. [18] Power of Destruction (滅びの力, Horobi no Chikara): A unique demonic power, which allows her to erase nearly anything, such as matter, energy and even immaterial things such as souls. She would originally often release massive blasts to engulf and erase her targets, but Rias has improved her control over her Power of Destruction to the point of being able to compress it into softball-sized bullets and release them in quantities Kiba compared to a machine gun, which he noted that those without enough power would vanish from one of them. Zeus • Poseidon • Hades • Apollon • Artemis • Erebus • Nyx • Tartarus • Chronos • Hypnos • Oneiros • Eros

Enhanced Durability: Rias has shown great tolerance to damage and pain, as she was going continuing to fight Regulus and remain in the Rating Game despite the intense blood loss. Memory Alteration: Rias has shown that she has skill in memory alteration, using it on Issei's parents.Rias has a fear of camels, because she got hurt by wild camels after she sneaked out to go to the farm when she was still young. [20] She holds her older brother, Sirzechs, in high regard (despite her older brother's antics of being a siscon) because she deeply cares for him. When she was a child, she was entirely dependent on him and held him in admiration, while also feeling inferior to him at the same time.