Monarch is a foundation that study the Kaijus and other monsters in the world, their are in charge of study them and protect the humankind from them or even help them. One day they discover a place where the Kaijus lives and call it Hollow Earth. They was searching for new species and they found a new tipe of Kaiju, then when they was investigating it they enter your cave and found you

(Name your species and describe yourself, you are free to be anything what you want)