Maybe it's too soon to call him an oshi, but lately I've been catching Mashiro whenever he streams and really enjoying his content.
I like that despite his feminine and cute voice and looks, he's quite boyish in personality. His little catchphrases that he says in falsetto when he plays games, "Hello" and "What the!?" are quite cute. Actually, he just sounds cute when he speaks English in general, which he seems to be able to read a decent amount of. I love that he always has a different horror game to play every couple of days and he seems pretty proficient at getting permissions for them. It keeps his content from getting stale, for me at least. When it comes to actually playing the games, he has good intuition and is quite decent at them. A good example of this would be when he played Gnarled Hag today, which he beat around 4 separate times, each time faster than the last trying to find a different ending. I love all of the different small little stories he brings up about his life, and they can range from funny to horrifying, suiting his horror character setting perfectly. I love hearing him geek out about whatever anime or manga he's been interested in lately and discussing it with the chat. He also has a great singing voice.
https://youtu.be/JoyhDWE7J-E 