Here, have a term that we coined a while back:
“Geode”, a system member who is a fusion of several fragments. Geodes (in our system) tend to be loosely bound, meaning that their personality can shift as the arrangement of fragments changes. Geodes tend to be more fluid than other members for this reason, and we tend to describe them more as the average of what they have been rather than what they are currently.
The name geode was used because, for us at least, on the outside, these members are indistinguishable from any other, but once you take a look in the inside, it’s completely different, and typically composed of a very jagged arrangement of crystal.
(This account and post are both explicitly pro-endo, exclusionists of any stripe are not welcome here.)