Izumi is the fashionable and flirty member of Team Hiragi. With a handsome face, he is very popular among women, even taking them out using Shuu's motorcycle. Though he resembles a delinquent, he is actually a caring guy. He is childhood friends with Shuu. (Source: Wiki)
Akane's friend and rival. Student of class 3-B.
Takaaki is the main male character. Takaaki is childhood friends with Konomi and sees her as a younger sister. In the anime, it is noted that he has an aversion to most girls save for Konomi and Tamaki, mainly because of their childhood friendship. He is a kind young man who, despite his shy nature around girls, is often very kind to them when the situation arises.
Very young student (10 years old in the beginning) in Nodame's school in Paris. His goal is to be a conductor. In OVA 2, he became 15 years old and is in love with Chiaki's cousin, Yuiko.
Tamaki is also childhood friends with both Konomi and Takaaki the two see her as an older sister. She left them when they were both children, having to go to an all-girls boarding school. Her promise to come back to Takaki in the final year of high school is what prompted her to leave her boarding school. She is very confident and comes from a rich family. She is well versed in traditional Japanese arts and traditions, yet still is a modern girl in her own right. In her group consisting of Konomi, Takaaki and Yuuji (Tamaki's younger brother), she is the strong and dominant personality and is acts as the older-sister figure. She often addresses herself as "Tama-oneechan".
Mitsuki is friends with both Takayuki and Haruka, but secretly she has feelings for Takayuki. In high school she was a competitive swimmer, but shortly after Haruka's accident, she finds herself leaving swimming to tend to Takayuki. She throws herself at Takayuki when he fails to climb out of his depression, and reveals her feelings for him. Mitsuki is well-meaning, but suppresses her feelings, allowing them to bottle up and explode in dangerous ways. Mitsuki also believes that she is responsible for her friend's accident, as she was the main reason why Takayuki was late for his date with Haruka. (Source: Wikipedia)