I like how Barry and Iris each were dealing with Nora being gone in their own way. Sendhil Ramamurthy's character has a nice parallel story with Barry, what with his mother issues and all.
Not sure I like the idea of Killer Frost needing to live a life...but I do like the idea of Ralph looking for Sue!
Cisco constantly has to study, repair, and modify tech and Caitlin often analyzes a new meta's biology or provides medical input when someone is injured.