A perverted high school student. He hates his father believing him to be the reason his mother died. He wields a power known as "blood pointer" which allows him to drain "element" from the people around him through his mouth. He has periodically used this ability throughout the series without knowing it. After the battle with the Venus unit he has begun to undergo training to understand this power and use it. He is the childhood friend of Haruko Ayama. His maken is known as "Overblow", which lets him cause his opponent's maken to gain incredible power and overflow with element causing it to go out of control and force the user to not be able to use it. However, when his opponent is able to contain the overflow of element or has perfect control over his maken, it would only provide his opponent greater power or even make the maken evolve into something greater. (Source: Wikipedia)
Motohama is the other best friend of Issei who made up the "Perverted Trio". Motohama has the ability to calculate a female's body measurements just by looking, which earned him nicknames such as "Perverted Glasses" (エãƒãƒ¡ã‚¬ãƒ� Ero-megane) and "Three Sizes Scouter" (スリーサイズスカウター SurÄ« Saizu SukautÄ�). Like Matsuda, he constantly spreads bad rumors about Issei out of jealousy of his relationship with the Occult Research Club. He does not know that Issei and the Occult Research Club members are Devils. Motohama is known to have better results than both Issei and Matsuda. (Source: High School DxD Wikia)
Birth date and place: Aqua, February 2 Height: 160 cm Age: 16 Blood type: O The first friend Akari ever made on Aqua, Aika is an undine for Himeya, the oldest and currently second-ranking water-guide company in Neo-Venezia. As the only daughter of its owners, she is also Himeya's heir, but does not enjoy the distinction that much, as she feels that she is fawned upon too much by the company's employees. Aika often speaks in an open and blunt manner, and goes out of her way to cut off Akari's many idealistic comments with a preemptive "Embarrassing remarks are not allowed!" (æ�¥ã�šã�‹ã�—ã�„セリフç¦�æ¢ï¼�, Hazukashii serifu kinshi!). Despite their contrasting personalities, she gets along quite well with Akari, and later with Alice. She is very proud of her undine abilities, and tends to be very competitive in this aspect. She also worships Alicia, and finds any excuse to go over to Aria company and spend time with her. Aika once said that if it was not for the obligation to her family, she would join Aria company. Aika has feelings for Al. (Source: Wikipedia)
The nurse who take care of Haruka when she in the hospital. She's a good person and realize the gap between Haruka and Takayuki. She once supported Takayuki when they coincidentally met at the street.
Although being friends with Takayuki, Haruka and Mitsuki in high school, he drifts off from the group after graduation. However, he becomes an important character towards the end of the series. He sometimes presents a counter-balance to the drama of the rest of the characters, as his relationship with his girlfriend (who remains off-screen) seems to be going well. (Source: Wikipedia)
A member of the Rising Star orchestra.