well.. i guess Rose depending on how you do the quests, she'll temporarily follow you to the VanGraff's but.. i think that works differently. come to think of it, they may have avoiding doing that entirely.
basically a temporary follower would have to be someone who dismisses themselves. NOT dying to end following (ex: Rose), and NOT being dismissed by you.
i'll look more into that, they may just have avoided that completely because they can't dismiss themselves with this new companion wheel. maybe.
Edit: AH! Deputy Beagle
and there's that NCR guy from vault 11 i think it is? the 1 with the raiders, you save him.
the bodyguard, Orris from the kings quest wouldn't count cuz u follow him, he has a stop distance but i dnt think that counts. (he won't run a certain distance from you)
i think if you go along with the tutorial, sunny smiles follows you at some point for a bit.