It is one guy using proprietary software he developed.
AiAngel is not a bot. It's Rouge's software that changes his voice along with facial recognition software which tracks his movement and copies it to the avatar.
That being said, he has created a very entertaining channel and line of work for himself. By looking at the videos, you can see that he is a true genius at work. Single handedly puts on all hats for that project, from hardware infrastructure development, to software design to graphic art to acting and video editing.