Beast

The beast is a type of enemy found commonly in certain types of Final Fantasy games. The use the lighting element to serve their purposes. They appear to a combination of a certain type of hybrid animal and possible used in as an attachment to the Soldier units.

Behemoth

The dreadful behemoth can be seen here. Always a powerful enemy found a vast array of Final Fantasy games (including FF2), the Behemoth is a tough monster with purple tough-like skin.

Flying Robot

This robot is seen in the E3 2006 trailer. It faces off against Lightning right at the end of the trailer, we are yet to see it in action. However, it peruses the train which lightning is on, so we assume that it is targeted for her. It has large Buzz-saw like saws for claws probably for cutting through metal to get to its target, then mincing them for a quick death.