Transformers Prime Restless Spirit

In this story, Miko has an older brother named Kai Nakadai. Only he isn't among the living, he's a spirit. Who watches out for his sister, trying to keep her out of danger.

Sadly since Miko is the only one to see and hear him, if anyone catches her speaking to thin air they think she's crazy. So she tries to not talk to her dead brother in public.