Here is a list of video clips that I feel embody the personality of Loki I experience. A lot of it is mood, tone of voice, body language, attitude, etc.
Enjoy! I may add more as they occur to me.
Alan Cumming "Floop" Song
Angry Crazy Loki. Comes with Free Flailing and Screaming.
Loki, when He wants to Fix your life.
Alan Rickman Loki - go to about 5 min in.