KeaRex

The KeaRex is a powerful creature that roams the Final Fantasy Universe's forests preying for other dinosaurs. It was created from magic and, because of this, it does not die of age. Despite what its appearance might imply, it is peaceful, unless it's hungry. It's very intelligent and can speak through telepathy.

Powers
It is unable to die out of old age and can only be killed in combat. And it's no easy task to do so, since it's one of the most powerful forest creatures in the entire Final Fantasy universe and can easily kill a normal T-rex with a single bite. It knows how to use magic, including Ultima, which summons a gigantic explosive blast that.

It's very intelligent for a dinosaur and can speak through telepathy, expressing perfectly his intentions through it. Its telepathy can speak even with robots, adjusting the signal to match with the robotic one. It can also spit Supah Hot Fire, but he's not a rapper.

As a summon
Magna Weegeepede once defeated it in combat. KeaRex then gave him the power to summon his spiritual counterpart (not exactly him, but has the same powers). When summoned, it will either use Ultima or simply devour Magna's foes.