Ooh, good question.

I don’t mess around much with vocals much, so might not be much use, but I had a quick play.

I think it’s basically reverb or a very short delay, but there’s probably more to it than just that.

I got something sort of similar with a reverb eq’d to only affect the lower frequencies, plus an envelope follower to bring it in more when the voice is raised.

Couldn’t get it quite right though. Might need to use gates or multiband compressors or other things I’m not very good at.

Also might help if I had a good bit of vocal performance to work with instead of random things from YouTube.

What toys do you have to experiment with?