Misei posted her first Youtube video on the channel in July 2021, and seems to have begun streaming at a similar time.
See also her PWD page.
 On her Youtube and Instagram she uses Misei Taguchi, with Western order; her Patreon, though, is under Taguchi Misei. Despite her origins in Beijing, I (bugcat) couldn't find a Chinese reading of her name. Her U-Go page doesn't have one. The PWDO might do, but I can't get character search to work for me. The Kansai Kiin, unlike the Nihon Kiin, doesn't supply pinyin on their site.
 DuEm6: Or is it 2012/Heisei 24, as the profile says? Someone who knows Japanese/Kansai Ki-in promotion system should check this. I'm not sure what "入段" means. She seems to have (pro?) matches since 2013, according to her goratings profile.)
yuzukitea: Her surname (in terms kanji/hanzi) isn't a Chinese last name, so her father is presumably Japanese (and I would guess that is her first language). Perfect Weiqi Database says she was born in Beijing, China. It would be read Tiankou Meixing in Chinese but IMO it would be more correct to use the Japanese reading in English. It says her teacher is Shiraishi Yutaka (9d) and she became pro in 2012. 入段 (at least in Chinese, means "became (one-dan) pro" -- although the kanji in Japanese is pretty much the same in Chinese).