We have an alter who is 3 people. She has always been that way and her 3 different ways are in harmony. One is very controlling and religious, while the other is very lenient and spiritual, and the third is in the middle (and also the weakest). (not sure since we don't have contact but that's what I can remember from back when we did) They have their own harmony and can function as one but also separately if the first would give them some space, which, she usually doesn't.
E and J1 started out as twins, I guess they still are but they're not close anymore cause he turned inwards to be an inner protector, while she turned outwards to focus on the external world. J1 is female and E is male but otherwise they look identical, blond, blue eyes etc.
E has a little 'brother' J3, who is actually E without having grown up, making them the same too. But different also, cause J3 is 11 yo and E is body age and he has changed a lot over the years.
J1 and J2 are twins, opposites, and they dont really get along that well. But they are twins.
J2, at one point we tried to solve her depression, which of course made a part of her split off accidentally ( I guess that seems logical now but I didn't think of it at the time), and that part seems to be semi-one with J2, yet also separate. Her name is an abbreviation of J2. They differ 7 years in age but they do see themselves as one and technically they are. They can function separately and together. And I guess it did kinda work out cause neither of them suffer depressions now. J2 sometimes gets this desperate feeling but nowhere near as bad as it was before.
Oh, and also there's this 7 yo girl who shares her identity with a dog. They are able to function separately as well as combined.