Is Yukimaru the three-tails Jinchūriki?
Because of his connection to the Three-Tails, Yūkimaru is also believed to have some connection with its former jinchūriki, Yagura. The two also have similar appearances, and both have an apparent connection to flowers, however, Yūkimaru is
an anime-only character.
What happened to Yukimaru?
He was
quickly captured by Rinji. Taking advantage of Yūkimaru's feelings for Guren, Rinji convinced Yūkimaru to take more of Kabuto's special pills and use his powers to control the Three-Tails. He used all of his strength to bring the Three-Tails to their location, and as he collapsed, he was caught by Guren.
Is Guren dead?
Guren never died. At least, not canonically. Well, the filler isn't canon in the first place but she never got killed. It is implied that she managed to raise him after leaving Orochimaru's influence, but that's about it.
Is gozu in love with Guren?
After Guren sacrifices herself to save Yūkimaru, Gozu is still shown to be alive in mud form at the bottom of the lake. The reason
he admires Guren is because she was the only one to treat him nicely at Orochimaru's hideout and gave him water when he was dying.