If you don't plan on spending money, you can reduce your list by quite a bit by filtering out the ones you can't farm shards for, like Leia. Barris is good but she's a slow farm, as you only get two hard missions (one each) at level 5 light and dark.
Sid (leader), Lumi, Boba, Fives, and Aayla would work well together due to crit and extra attack synergies.
I often use Sid, Boba, Lumi, Barris, and Leia but I got lucky with cards and have Leia at 4*.
You have a great set to play with. Best is to just read their abilities, see how easy they are to farm (get to 7* quicker, they will), and decide who you like playing with. I feel that with the majority of players using similar cookie cutter builds it will be the unexpected and unusual combos that end up succeeding best.
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Sid (leader), Lumi, Boba, Fives, and Aayla would work well together due to crit and extra attack synergies.
I often use Sid, Boba, Lumi, Barris, and Leia but I got lucky with cards and have Leia at 4*.
You have a great set to play with. Best is to just read their abilities, see how easy they are to farm (get to 7* quicker, they will), and decide who you like playing with. I feel that with the majority of players using similar cookie cutter builds it will be the unexpected and unusual combos that end up succeeding best.