User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-4802891-20170526200433/@comment-30314236-20170607231735

I read all the books, watched all the movies (except the new one, I still have to) and even joined Pottermore some time ago.

And now that I look at all the information, I'm 100% sure he is Harry Potter.

What he rides isn't a phantasmal Beast nor a vehicle, because is a magic broom! But he also rode Phantasmal Beasts like a thestral and the hippogriff Buckbeak.

His appearance as a black-haired Jekyll is also another hint.

The third skill, ??? of the beloved survivor or ???: False Vessel of Immortality, that's a reference to the fact that he is an horcrux!

Also, now his NP is clear. It must be Expecto Patronum, a spell that can repel dementors, dark beings that consume the happyness of humans.

English, a cauldron, his head, he could be a Caster... Can I bet everything I have? Because I'm sure he is Harry Potter!

...I think I got a bit carried away, my apologies.