Norse god of Trickery: Loki's Many Forms
In his studies in the two years he was under cover he wandered into a land far from the shinobi nations and discovered that wether on purpose or otherwise he was named after the Norse god of Fire and Trickery Loki.
As he had discovered this he had created himself a technique of sorts to take on many forms that he had read of in the Norse Gods Mythology.
Form of Fenrir
This technique takes one hand sign the sign of the Dog followed by Form of Fenrir.
This Form of Loki turns him into Fenrir a son of Loki:

This Form gives Loki a boost in dexterity and speed as well as access to some interesting techniques(For a later Made Up)
Form of Jormungand:
This technique takes one hand sign the sign of the Snake followed by Form of Jormungand.
This form of Loki turns him into Jormungand a son of Loki:

This form gives Loki a boost in dexterity and speed as well as access to some interesting techniques(For a later made up)
Will of the God
Loki utilizes a few handsigns that allow him to change his form into any living thing he sees fit. These forms are nothing more then a transformation Jutsu and they give no added bonuses.