Nobuko Ishihara (石原 信子) is a support character in the romantic comedy shōjo manga and anime series Lovely★Complex created by Aya Nakahara. Nobu is from the Osaka Prefecture on Honshu Island in Japan and is Risa Koizumi's best friend.
In the anime, Nobu has dirty blonde hair and brown eyes. In the manga, Nobu has orange hair and reddish-brown eyes much like Risa. Nobu wears a school uniform consisting of a white dress shirt, gray skirt, blue knee-high socks with white stripes, a red ribbon, pink flats, and accessorizes with various bracelets. During warmer weather she wears a peach sweater vest with a red stripe and star, and a peach cardigan with red stripes on the arm, red buttons, a red star, and a red loose fitting ribbon during colder weather. She wears the same uniform to school in the manga as she does in the anime, but only during important school events and not year round like in the anime. Nobu wears extremely stylish clothing when not in her uniform, these outfits are often picked out and styled by Risa. Nobu's short wavy hair is usually worn down with two small braids framing her face, but she will occasionally tie her hair up in a ponytail or two side buns.
Nobuko has an affectionate nature, and exhibits protective behavior over both Risa and Nakao. Frequently throughout the series, Nobuko lashes out at Ōtani for being inconsiderate towards Risa's feelings. Her behavior towards Nakao is full of loving words and baby talk which is immensely different from how she treats other people.
Nakao is Nobu's boyfriend from before the series began. Nobu claims they started dating due to their known mutual interest in each other. The story goes that in their last year of junior high together, Nobu said, "I wish I had a boyfriend like Nakao," and Nakao reciprocated with, "I wish I had a girlfriend like Nobuko" and the rest was history! Nakao and Nobu are extremely loving and affectionate towards each other.
After Nobu had confirmed her plans to move to Hokkaido with her grandmother after graduation, Nakao started to act strangely. Nobu eventually overheard Nakao saying that he did not want Nobu to leave for Hokkaido but was too nervous to tell her because he did not want to hold her back from what she wanted to do. This caused strain between the couple and Nakao tries to get Nobu to break up with him by pretending to be a player and cheater. Nobu knows what he's doing and doesn't break up with him, but confirms her decision to go to Hokkaido which shows Nakao that he is not holding her back in any way. They maintain a long distance relationship after graduation.
Risa Koizumi and Nobu met their first year of high school (equivalent of 10th grade) and have been best friends ever since. Risa considers Nobu to be her older sister figure since she is the most mature and wisest about relationships, and is older than Risa. Risa often asks for Nobu's advice on how to confront Ōtani about her feelings and later regarding her relationship with him. Nobu is greatly disgusted by some of Risa's habits, like her obsession with Cain-sama and later Maity-sensei.
Chiharu Tanaka and Nobu met their first year of high school (equivalent of 10th grade) through their mutual friend, Risa. Chiharu is often by Nobu's side quietly supporting her advice to Risa and sometimes even calming Nobu down when she gets angry.
Atsushi Ōtani is Nakao's best friend and has known Nobu since junior high. Nobu is easily irritated by Ōtani's idiocy when it comes to his relationship with Risa and his overall arrogance. She has a lot of fun picking on him for just about everything he does.
Ryoji Suzuki and Nobu met during remedial summer classes during their first year of high school (equivalent of 10th grade). Suzuki is the boyfriend of Nobu's close friend, Chiharu. She doesn't speak much with Suzuki, but still considers him a close and trusted friend.
Seiko Kotobuki and Nobu met when Seiko briefly dated Ōtani. Nobu did not initially like Seiko because she got in the way of Risa's chances with Ōtani. Seiko and Nobu eventually formed a friendship after Ōtani and Risa started dating, and enjoy's talking to her about fashion.