About the new Explorer/Adventurer rings for those wondering.

I heard a rumour you can get the ring then delete the character and keep the ring, is that true? b/c I don't have a lot of space on my main acc, and it would save me some NX down the road if I don't need an extra char slot for Dual Blade. I doubt it'd work like this, but it's worth checking right?

As long as you put it into storage before you delete the character, yes. You can get as many as you storage will hold.