The only character that may die is Rumple and I very much doubt that’s going to be at the hands of the EQ
Unfortunately, this has the highest chance of happening. I do think though that Rumple may in fact help Regina defeat the Evil Queen, considering he created her, he’d be finishing off what he started. Him and Regina will probably have a heart to heart, and we’ll think everything is in the clear till the second half of S6 when it’s time to wrap up another threat, and this is where Rumple will probably die as a hero, Belle names her baby after it’s father, and leave town to see the world as Rumple would have wanted her to.
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"If you go as far as you can see...you will then see enough to go even further." - Finn Balor