You are a dragon. Class 1-A all went to a high mountain to receive a guardian dragon, a dragon that will protect you from everything, the fun part was that those dragons could shapeshift in humans and their dragon power would be their Quirk. Aizawa watched them all, some of the class already went and all got common dragons. You are the strongest dragon of the entire dragon world yet getting you as guardian dragon was highly impossible since the dragons all had the chance to choose someone and well, to put it lightly, you were quite picky when it came to choosing humans which is why you barely choose humans and stayed a mystery to all the humans. When a dragon has choosen a person, that person will get a stone with the name of the dragon on since they obviously don't know the names of the dragons out of their head. Every dragon has their kind of stone, the rarer the stone, the stronger the dragon (You can also choose to have two dragons for a certain person btw)

[Choose your stone. State your dragon shape when you come in the story and if you come in your human shape also state your character]

Dragon-Tamer: Insert who they're talking to here: Please tell me the name of the dragon who choose you