Ever since Kazuna AI appeared, more Virtual YouTubers appeared and became a trend. But, none of them can exactly speak English until recently.
A Virtual YouTuber named Siro is starting to speak actual English. Her full English is decently clear and it's still the same person who spoke Japanese. Check out her English introductory video.
Technically, there's another Virtual YouTuber who can speak English. Her name is Mirai Akari. In comparison to Siro, she currently speaks some clear English. Check out her VR Chat interview video on how she does some English interactions with people.