I've never watched Nijisanji and don't know anything about them but once the drama happened I avoid them completely even if they didn't have drama I still won't likely bother with them because the main reason is the character designs are just bad. Lot of people forget the main factor on why people watch vtubers are the designs, there's a reason Holo is so popular and many unique indies but Nijji designs are just generic as they come like at least a niche thing like Voms has a unique artstyle and look. The problem with lot of vtubers designs is there's too much stuff going on, learn to keep things simple not to the point it looks like a blob but simple enough someone could do a cartoon drawing of it and you still know who it is like those Holo animations done in the 90's cartoon styles.