Freak is a rare enemy in Final Fantasy Type-0 encountered in most post-story missions, the seventh Expert Trial and the Blast Site. It is a member of the enemy family of the same name, sharing a family with the Supersoldier Akkad, which is fought in the main story.
Freaks are slow enemies, but they hit hard.
The Freaks encountered in Chapter 7-Crimson are easy for your characters to kill and do not pose an obstacle.
Those enemies encountered in the Blast Site are weaker than Akkad, but still hit hard, however, the difficulty arises in that the Freaks are very resistant to magic and ballistic damage, meaning you have to get in range of their powerful sword swings.