Character Description: Kurenai Yuhi
Yuuhi Kurenai is a rookie Jounin of Konohagakure. Her squad, also known as Team 8, consists of Hyuuga Hinata, Inuzuka Kiba and Aburame Shino. She specialises in both tracking and Genjutsu. She graduated from the Ninja Academy at the age of 9, and became a Chuunin at age 13. She tends to favour Hinata over the rest of her team, because of how her father sees her as.
Kurenai is the overseer of Hinata Hyuuga, Shino Aburame, and Kiba Inuzuka in the Genin Team 8. Although a new Jounin herself, she is an expert in Genjutsu, or illusion ninja techniques. She spends a lot of time with fellow Jounin Asuma Sarutobi, and it is strongly suggested that she has a romantic relationship with him, especially after the two year time gap. The last we see of her is when Shikamaru comes to tell her that Asuma passed away during a mission, where she breaks down and cries.
Kurenai trained a girl named Yakumo. Yakumo put all of Team 8 and Naruto and Sakura in a genjustu world that looked similar to Konohagure, but Konohagure was demolished. Soon after they learned that Yakumo had made the world and try to stop her.
Naruto was the first one to wake up and he shook the others awake. They went to the place were Yakumo was hiding. They had a little trouble getting there, but Naruto managed to get through. Kurenai was in the room with half her body disappeared and Yakumo had a painting, which was Kurenai. Naruto managed to persuade her that she wasn't alone. Yakumo realized that the Hokage hadn't set flame to her house and claimed her parents' life. The demon within her, the person who makes the genjustu, had set flame.
After she had given some hope in Kurenai, the demon had come from within her and also persuaded her that Kurenai wanted to kill her and that Yakumo shouldn't spare Kurenai's life. But Naruto wouldn't let that happen so he started forward but got stuck in the demon's helping hands. Or just very big hands that held Naruto by the arms. Then out of the blue, Yakumo used her glazer to kill the demon and conquer her fears.
In the end, Yakumo learns that Kurenai, when she did the seal for Yakumo's ridiculous genjustu, was only trying to protect her. And Kurenai decides to go back to Team 8.
Hints, throughout the anime and the manga, have been seen showing Kurenai and her fellow Jounin, Asuma Sarutobi, having mutual affection for each other, Kurenai even crying at Asuma's death, and being one of the few to put flowers on his grave after the funeral.
In Chapter 342 of the manga we find out that Kurenai is pregnant.