Anger
It wasn't fair! It wasn't fair! Why was he always compared to Thor!? He was not Thor, and never would be. He and his brother were polar opposites! "Thor" this and "Thor" that! It was sickening, people always singing Thor's praises and practically licking his boots! Loki had had enough! Just because he was a sorcerer, not a warrior, it didn't mean he wasn't as capable as Thor! Loki growled. Just thinking about Asgard's "golden" prince infuriated him. He didn't hate his brother but ARGH! Loki balled his hands into fists, and began to pummel the wall, his father's words ringing in his ears "Why can't you be more like Thor?" "Magic is a woman's art, Loki! Go spar with your brother, maybe he will teach you something!" "My son Thor! A magnificent warrior!" "My wonderful son Thor!" "Have you met my son Thor? Future king!"
Loki gritted his teeth, his hands stinging as blood welled up from his knuckles. The wall was crumbling away beneath his fists, something he sometimes wishes would happen to Thor. A single tear of anger rolled down his porcelain face.