Hero or Demon? ( Blue Exorcist and BNHA crossover)

Ch.2

Rin's POV

I was ready for whatever he's gonna throw, I got my position ready " you got what it takes to beat a hero like me?" He said with a smirked on his face wait? He's a hero? This old man doesn't even act like one while I was too busy on my thoughts a gush of flames immediately was heading towards my direction, I snapped out of my train of thought.

I immediately got of the way, damn he's fast with his flames I'll just have to use my flames.

As I begin to realise my sword, My blue flames appeared all over my body, my ears got pointer, my teeth sharp as ever and lastly my tail, its blue flames waved at its end revealed.

I charged at Enji " use your flame against me!".

Endeavors POV

What's with this kid? His spirit is strong
But the way he used his quirk it's odd he used his sword to active more of his blue flames and look different could his quirk be transformation? He could be a good use for surpassing that pity ALL MIGHT.

I heard Rin saying " use your flames against me! " charging at me " do it! " he said I didn't bother hesitating neither did Rin, We both send out a gush of flames to each other.

Time skip
Cant do fighting scenes very well

Huff... Huff... I underestimated this kid,
He's more powerful than I thought maybe I could train this kid to be my other successor like Shoto.

Rin's POV

Damn this old man is strong luckily for a demon like me I can heal fast, how long have we been battling? I did manage to get a few hits on him " old man do you believe me now huff.. Huff.. I'm not huff.. Huff.. from here? "
I struggle to keep my body still from exhaustion

I waited for him to respond " yes, I do believe that, you impressed me I'll take you to my place so I can train so you can beat ALL MIGHT I'll let you met my son Shoto Todoroki " he said.

" Great! I knew you'd believe me! " I said all excitedly, I closed my sword and place it back in the red sheath.

As I walk toward the old man " follow me and don't use my real name out in public, call me Endeavor " he said Undeavor? What kind of name is that?

( if you read the blue exorcist manga you would know he couldn't even say Amaimon's name right instead he says Unaimon so I'll do that with Endeavor)

While Endeavor is taking me to his so call home I had my hands in my front pockets, " as today now you are 2nd successor incase my son Shoto " he said to me not even looking at me.

Okay so this old fart basically has a son name Shoto and wants me to be his 2nd successor? What is he even planning?  damn right now I don't have time to think all this thinking is making my brain hurt.

We stopped some at some place which I can only describe a Japanese style house not bad for a some grumpy old man reminds a bit like Father Fujimoto.