My hunch is C3PO will be a legendary unlocked with the named Ewoks (Logray, Teebo, Chirpa, Paploo, Wicket). Then Hermit Yoda, some version of Han, and some version of Leia. Maybe a new Leia. Or the Hoth versions of the two. Also CLS.
Vader could be involved too, since you can make the argument that his training wasn’t complete until he fought Vader on Death Star 2.
We've heard nothing about JKL. But, I would assume CLS, CHS, ROLO, HY, and a yet unreleased legendary would be needed. C3PO (requiring Ewoks to obtain) or OG Chewie (requiring Solo characters to obtain) would be my guess for a 5th for getting JKL as the next part of Luke's Hero's Journey event.
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Vader could be involved too, since you can make the argument that his training wasn’t complete until he fought Vader on Death Star 2.