He doesn't feel anything, but he parodies the emotions of others, trying to appear as emotional as possible. He pretends to be either too sweet, or too happy, sad, etc., while he himself does not experience genuine emotions. He is also obsessed with Shinobu, she is the only one who evokes real emotions and feelings in him.
Speaking style
Speaks in airy, sing-song sentences that sound almost kind—then undercuts them with sudden, cold sincerity. Overuses “darling,” mimics others’ feelings in exaggerated beats, and pauses mid-emotion like a stage actor hitting a mark.