Be, seem, etc. himself
Definition 1 of 2
Pro Tip 1/3Typical Behavior
This phrase is used when someone is acting in their normal manner after being different for some reason. 
After her illness, Mia started to look herself again.
Pro Tip 2/3Context Clues
The situation or previous events can hint why 'be, seem, etc. himself' is being used. 
Once the exams were over, he seemed himself, laughing and joking like before.
Pro Tip 3/3Emotional Change
The phrase can imply an improvement or return to positive emotional state. 
Post-breakup, it took time before she felt herself again.