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Ok for instance, trying a strange build here but

can an independent character join any squad it wishes like for instance a heavy weapons team?

Can a tyranid prime join a tyranofex?

You can join any squad that does not always consist of one model.

That means you can attach a Prime to a Carnifex Brood, but you cannot put him with a Tyrannofex (always 1 of them). You can join a Heavy Weapons Squad or a Devastator squad but you cannot join Mephiston or Crowe who always count as a single model.

Unless the IC has a restriction on joining a unit (i.e. Eldar Phoenix Lords), the unit specifically states that an IC cannot join it, or the unit always consists of 1 model (i.e most Monstrouc Creatures), the IC can join them.

Extra exception: ICs cannot join vehicle units, even if the unit can consist of more than 1 model.