Jason.. Jason hadn't know what to think of Perseus Riddle when he first met him. 

He knows how important this demigod wizard was to the people at Camp Half Blood. He knows that this son of Poseidon was instrumental during the Second Titan War where the Greeks had to defend Olympus itself from Kronos's army. He knows that the prophecy was about him. 

But he also heard the whispers. The rumours that Perseus's adopted father was some mad man whose killed thousands in a magical realm Jason doesn't even want to think about (two different worlds of myth was enough thank you very much). He's heard that he wasn't.. good. 

How could a hero not be good? 

He asked this to Chiron once, before he left on a giant flying ship towards a home he barely remembers. 

"There is no good or bad with Perseus" the wise centaur had replied, brows furrowed as if trying to solve a complicated puzzle. "He's powerful and incredibly loyal and he'll do absolutely anything for the ones he gives his loyalty too, even if it means to burn the world."

The answer sent a shiver down his spine and left him with more questions than before. 

Then.. he met Perseus. 

He was everything Jason was not and Jason was everything he was not. 

They were opposites cut from the same cloth. The both of them lost their mothers at a young age and were raised to be leaders. That's where the similarities end, however. 

Jason grew up in the New Roman empire with all its order and structure. He was raised to follow valiantly, he grew up to lead righteously. 

Perseus grew up with Purebloods and was raised by a Dark Lord. He grew up on chaos and madness disguised by riches and glamor. He follows nobody but his father. The line was blurred for him, there was nothing to separate the light and the dark. His people, his family spat on the valiant and the righteous. 

Jason was a clear blue sky where Perseus was a relentless storm. They mesh together as well as oil and water.

The son of Poseidon was all sharp grins and calculating eyes that hid a violence and power everyone aboard the Argo 2 can feel. Even Annabeth admitted that this was not the same boy who she once loved. Something had changed him after the Titan War, something none of the Greek campers seem to know about. 

Jason was pretty sure Leo was kind of scared of him. 

But in the end, does it matter? Jason finds himself asking. Perseus is smart, probably one of the smartest person Jason has ever met. He's witty, cunning, and he is so charming and persuasive on his own that he hardly needs charmspeak to get anyone to do his bidding. 

Like Chiron said, Percy was loyal. He'd do anything for Annabeth, he would do anything for the crew of the Argo 2 even if it meant doing things nobody else dared to do. 

For one thing, Jason was just glad that the son of Poseidon was on their side.