The Tyranno is one of the main antagonists of Genshi Shonen Ryu. It is a carnivorous one-eyed Tyrannosaurus that terrorized many lives during the prehistoric times, mercilessly destroying anything or anyone in its' path.
Tyranno is an large obese brown Tyrannosaurus with one good eye and a blind eye. His arms are very small but he is very strong.
For some the Tyranno is revered as a god, while many others feared it as a demon; it's terrible cry is enough to scare away any living being. Due to it's massive size and brute strength, the Tyranno is nearly impossible to defeat as no other living being was powerful enough to challenge it, making it the most dominant predator that roamed the prehistoric lands. The Tyranno lost it's eye during a confrontation with Kiba, who had been hunting the Tyranno endlessly ever since it killed his family and tribe.
- Tyranno's roar seems to be a reused roar from Godzilla.
- He looks very similar to Sharptooth from Land before time as they both loses sight on one eye and hunts the protagonists.
- Unlike a real Tyrannosaurus, Tyranno is shown to be able to use his arms.