Dragon Guardians poster

Got some kind of idea for a while, and this poster was born!

Story:one night, a kid was walking alone until he heard fighting, and saw four dragons fighting some shadowy figure, and the figure saw the kid, and tried to get the kid so the dragons can give up, and one of them protected the kid.
And the next day, he thought it was all a dream, but he was in his very big clubhouse next to his mansion. And the dragons were sleeping along with him. and try to keep a secret of them to his parents. (Although some of his servants swore secrecy with him)

Since that he can't pronounce the dragon's names. He calls them human names.

Alex: The brown and gray furred dragon who protected the kid, and wants to learn more about humans. he is mostly bothered that he has no memories.

Leon: The orange and light brown scaled dragon, A rebel who doesn't want anything to do with the humans, but will help them out anyways. Wants to help Alex get his memories to come back.

Lisa: The small fairy dragon, wishes there was another to not fight, but will fight if her friends need help.

Fùqīn: The asian dragon who's the oldest. knows the ancient world were the dragons came from, and also wants to know about the human world.