Putting aside the already confirmed He-Man, She-Ra, Sorceress, Trap Jaw, and Beast Man...
Battle Cat - PCS did a great one, but I think TH can do a better and more realistic version (and in the correct scale)
Panthor - PCS didn't get around to him at all which is a reason I held back. Both cats were two of my childhood faves and they're a package deal to me. Make just a variant/repaint or a whole new sculpt... I'm good with either.
Tung Lashor - Although he came later in the line, this became another of my huge childhood faves. Since 200X brought the Snake Men in earlier, there should be more fans.
Rattlor - Another package deal duo from my childhood.
Zodak (200X style) - A long shot, but I love the character. Fandom seems split on which one they like more between Zodac (80s vintage) and Zodak (MYP), but this could be an easy variant... just a repaint and new portraits.