One interesting storyline could be a Jedi who survived Order 66 in a way that wasn't shown in the game. They might be hiding on a remote planet, using their skills to help the local population without revealing their true identity. Another could be about a new character who discovers they have Jedi potential and tries to find a way to train themselves in the post - Order 66 galaxy.
There could be a story where Cal has to team up with an unexpected ally, perhaps a former Imperial who has had a change of heart. They would have to learn to trust each other despite their differences. This could lead to some tense and exciting moments as they work together to evade the Empire and help other survivors in the galaxy.