You left out Talia.
There are three ways you could make her more viable. (That I'll cover here)
1. Increase her healing from basic attacks and reduce the cooldown on her heal. The % of turn meter would probably need to be adjusted down. This creates a system where she heals over time to compensate for the health list by her party heal. This also doesn't work in the current speed meta but would help in DS battles.
2. Remove the health loss on party heal and buff the amount healed. This is the easy option but it turns her into a generic healer. I like balancing the risk of losing 20% health for the party heal. That said, the DS needs a healing system overhaul and I like offensive healing for the DS. (Life drain, DoT, etc.) it just fits.
3. Give Talia an AOE attack placing a dot (similar to Sid) on the enemy team, subject to removal it would heal Talia and her party members for say 4% per dot present on the enemy team. This is a fun way to bring some interesting dynamics to dark side healing.
