>>83134683They can improve a lot if they go total full immersion mode. Henya was already pretty good by JP standards before joining VShojo, but she's picked up a bunch of vocab and improved her reading comprehension skills a ton after having a mostly EN chat and doing mainly EN collabs. Similarly Kasii had basically no English skills at all before gaining exposure from Asmon and gaining an English audience. She's constantly doing her Duolingo reps on stream and managed to do her first collab with an EN vtuber recently.