The busty school nurse with knowledge of the Qwasers.
Urada Oikawa was an old friend of Shinichiro Ootori and Yuudai Yamanobe, and helped them with their investigations and plans. Though she works in the St. Mihailov Academy as a nurse, she has connections with Athos and is aware of the movements of the Qwasers. She treats the students of the academy and sometimes helps them with their personal problems or other issues (in case of the students that are Qwasers).
Urada Oikawa is a supporting character from the anime/manga Seikon no Qwaser, created by Hiroyuki Yoshino. Urada first appeared in Seikon no Qwaser Volume 03, CH. 10 "Atomis of Two Faces II", and her first anime appearance was in Seikon no Qwaser - Episode 05 "White Lilies of the Battlefield". Her character in the Japanese series is voiced by Sayaka Ohara.
Urada is a calm person, uses to smoke and normally appears after an important battle to treat the injured. She doesn't have important changes during the series, except that she later showed to be attracted to Sasha, first when she tried to undress him in the hot spring and later when she had a close encounter with him in her office (read below). She has connections with Athos, specifically with Yuri Noda and seems to get on well with Mafuyu and Tomo (partly because they're daughters of her old friend Yamanobe Yuudai).
(All the information below is according to the anime version)
Urada is first seen in episode 05 telling off Hana because she arrived late to class and because besides that she left the classroom with the excuse of having a supposed stomach-ache. She later has another brief appearance in episode 09 where she treats Katja's wounds of her fight with Yuu Kuchiba. After the attack of Eva Silver in the St. Mihailov Academy, Urada (while she was measuring Tomo's breasts) had a little conversation with Mafuyu about Sasha who was embarassed because of all the fangirls and boys that wanted to call him by his alias "Sasha". Mafuyu was happy for him, but at the same time she was a little bit worried, so Urada told her that even though Sasha was experiencing something completely new to him, he would get used to it eventually.
In episode 13, Urada went with Mafuyu, Tomo, Teresa, Fumika, Hana, Katja and a weirded-out Sasha to a hot spring. Urada tried to undress Sasha in order he could take a bath in the proper way alogn with the other girls, but her true intention was that she was interested in the attractiveness of his naked body, Sasha was really embarrased so he didn't let Urada undress him. Urada is seen later having a dinner with the girls and Sasha. Later in episode 18, while Sasha was fighting with Tasuku in the academy's roof, Urada had a conversation with Mafuyu about what is better, the shape or the size (of the breasts). Two weeks after Tomo was kidnapped by the Adepts, Urada contacted with Sasha and had a close encounter with him, she later told him a little bit about who was she and what she knows about Yamanobe Yuudai, she also gave him a special book which later Sasha would use to open a secret compartment in a bookcase of the academy, which contained some documents that revealed the way to the Theotokos of Tsarytsin.
In episode 21, Urada healed Tasuku's and Mutsumi's wounds after their battle against the adepts Jita and Milk. Though Mutsumi had the worse wounds, she wanted to provide Tasuku with her soma, Urada stopped her because she considered that Mutsumi was too weak to provide soma, so Urada offered hers, as consequence Mutsumi felt jealous and took Tasuku away. Shortly after, in company of Yuri Noda, Urada felt how her soma was taken out due to the "Sword of Maria" sealed in Mafuyu, which was recolleting soma from all the women in the world. By the end of the season, Mafuyu went to Urada's office for a check-up because her breasts were getting smaller, she asked the nurse if it was possible to make them bigger like before (when the "Sword of Maria" was activated), but Urada only laughed really hard and told her that it was impossible.
Urada returns in the second season of the series in the episode 07, after the battle in the Roman Curia Suirei Academy. She treats Jita and Yumie after Tomo found them unconscious somewhere near the St. Mihailov Academy. Urada told Tomo that Jita was OK, and explained her the functioning of the device that Jita had in one of her breasts, then, before leaving the room, Urada warns Jita not to make any fuss, because trying to use her qwaser powers could cause an accumulation of soma in her body. Time later, Urada appeared to help Tomo and Jita who were having problems with one of the thieves that stole the file that contained the body measures of all the girls in the St. Mihailov Academy. First Urada gave Tomo an elemental circuit (that looked like an egg) which transformed her into "Mademoseille Tomo", then she started emiting/firing beams with her breasts and got rid of the thief, the problem was that she couldn't stop it until she ran out of energy. Urada said that she was glad she didn't use the elemental circuit in herself.
The school nurse had another 2 brief appearances, the first one in episode 10, where she gave Hana and Fumika a book that teaches how to get big boobs, and the second one in episode 11, where she went with Miyuri, Fumika, Jita, Yumie, Nami and Edgar to the St. Mihailov's hot springs.
Urada appears in the Seikon no Qwaser OVA titled Jotei no Jozo (or Portrait of the Empress in english) and along with Teresa made medical examinations for all the girls in the academy. She started with Katja and her classmates and used the fact that Lulu Shizaki was wearing a bra that didn't suit her to teach the young girls how to measure correctly their breasts (so they can buy the appropriate bra) and to show off her attributes. She later examined Mafuyu and her classmates and kept away Sasha and Ootori who were peeking and fighting close to nurse's office.
Seikon no Qwaser: Portrait of the Empress (OVA)
This OVA is a parallel story that happened between the episodes 10 and 11 of the anime series "Seikon no Qwaser", that's why it's also ...