Definitely Hermione. She is smart and would be able to help Ichigo understand the complex magic world. Also, Hagrid. He is kind - hearted and has a lot of knowledge about magical creatures, which could be useful for Ichigo.
Fan Xian had many female partners in " Celebrating Years," including Lin Wan 'er, Liu Sisi, Haitang Duoduo, Si Lili, and Zhan Doudou. However, there was no mention of Fan Xian having a specific girlfriend. Therefore, according to the information provided, I don't know who Fan Xian's girlfriend is.
Wei Daxun's girlfriends were Qin Lan, Yang Mi, Li Qin, and Ma Su. However, there was no specific information on who his current girlfriend was. Therefore, it was impossible to determine who Wei Daxun's current girlfriend was.