Hive Mind: The Transcend is not a traditional Hive Mind, it’s a collective consciousness, or group intellect. The difference, as it will point out to you at some considerable length, is that all of the members retain their individual personalities and perspectives as well as contributing to the whole, that while knowledge is shared, individual memories aren’t (at least until one is poured into the soul-ocean on permadeath), and that the true hive-mindedness is that of the Transcendent soul-shard that’s grafted into your personal consciousness (see Touched By Vorlons), but which does not constitute all of it. And that the Transcend has a (very large) metamind of its own (see Deus Est Machina), over and above and simultaneously within the collective aspect.
There are also, of course, genuine Hive Minds which do abolish individual identity, which are called Fusions, but since (a) resistance is not futile, because they only take volunteers, and (b) by far the most common type of Fusion is the Self-Fusion, made up of multiple instances of the same mind, they’re not anything to worry about.
(Okay, yes, in civilized space. Hegemonizing swarms with a degree of intelligence are not unknown outside it, even to the extent of things like the Leviathan Consciousness, and the less said about things like the Calphrast Hordes the better, but still…)
The temporary kind (see the Mental Fusion trope) are known as confluxes, often used for tactical military purposes and in other situations where close teamwork is required.