Lor San Tekka
Remember that guy at the beginning of The Last Jedi that was suuuuuuuper important even though we’d never heard of him? Well that’s Lor San Tekka and in the time between episodes 6 and 7 he apparently showed up to be a crucial advisor to the New Republic. He also taught Luke a bunch about the force, despite not being force sensitive himself, and he was once a part of a cult that worshipped an egg they believed the savior of the universe would hatch out of. Sounds like a cool guy!