Legends vs Canon vs Pop Culture

No, Lets keep things within the realm of the Star Wars Universe

Not only should we stay in the SW universe, but the powers that be wouldnt allow that. Too many people from agencies that control the current universe have to approve character design and would never let that happen.

Swgoh has has the opportunity, to being their own game. Plus there are piles of Star Wars games out there that have created their own heroes. Heroes familiar to fans show up in them more often than not as cameos or bonus of some sort. Looking just towards legends or expanded universe shouldn't really be so much of a barrier, for swgoh. They are from Star Wars. Pushing even beyond that gives the chance for this universe to assimilate more of the others. Hero design and approval of heroes, agencies involved might love working together

There is no need to have characters from outside star wars, There is more than enough characters that they can add as it is.

There's no question as to how they can find a star wars hero in universe, or give us ones they create like the Jedi councilor, resistance trooper and so on. But perhaps reaching out to the right celebrity, or like pop culture created hero like who could it be batman or something, that could be used to broaden the fan base. Some out there haven't seen the original trilogy but have gotten into star wars from other stuff