Kyoushoku Soukou Guyver II

A limited number of weaponized/genetically augmented humans must defeat a seemingly endless population of engineered monsters, for the sake of humanity. Where the characters of Terra Formars are determined to exterminate highly evolved cockroaches on Mars, to stop the spread of a fatal virus plaguing earth, the MCs of Guyver stumble into a society of genetically engineered monsters, with the intent and resources to dominate humanity. (Kyoushoku Soukou Guyver II is a continuation of Kyoushoku Soukou Guyver) 

Ah, the one fight that many mecha fans would like to see - Guyver vs Blade. It would be epic beyond proportion. That said chances are if you enjoy one of these you'll like the other, especially for the over the top action. Both Guyver and Blade are extremely powerful characters that fight to protect the Earth and their friends from various monsters and aliens. Tekkaman Blade does a better job at storytelling and handling emotion, while Guyver has a lot of interesting plot twists and ideals. 

Your classic 90s hero fighting monsters on Earth. The first few minutes of Tetsuwan Birdy reminded me so much of the Guyver OVA series --- dark mood, the music, everything. If you've seen one of these shows, then make sure you check out the other. I can guarantee you'll love it. 

People can transform into battle ready forms, Government conspiricy. Can't trust no one, always in danger, And when shit hits the fan, the heroes kick ass 

When you have an organization after you and you have a power that you aren't aware where it is from, but you fight for your life. Both anime's start from this plot, and if you like Guyver's tragic development into a powerful weapon then you will enjoy Generator Gawl for sure.