- Groups where not everyone sings. the rest of the members are usually called Performers
- Massive groups like AKB48, Morning Musume with graduation system (occasionally debut some with a lot of members in kpop that could or not have the graduation system but like you guys said they tend to be disliked and disband pretty quickly or loose the graduation system)
- co-ed groups (i feel jpop have more tendency to debut mixed groups than kpop and they also tend to last longer, even tho is also not that many compared to BGs and GGs)
- groups with different sonority and identity (bc i feel almost every single kpop group sounds the same since they tend to follow what is popular instead of daring to do/be different)