Loki - A Bad God's Guide To Being Good by Louie Stowell

After one trick too many, Loki is banished to live on Earth as a "normal" school boy. Forbidden from using his AWESOME godly powers, Loki must show moral improvement. As he records his lies THE TRUTH in his magical (judgemental) diary, it becomes clear Loki hasn’t a clue how to tell good from evil, trust from tricks, or friends from enemies.