I remember a part on the anime when they were stuck on the ship...
hmmm the thing is shawn was put in the manga as an important character that would qualify him as an antagonist... he meets all the requirements.
If I can recall he thinks of Japanese as inferiors... I dont quiet remember him saying something like that but he does say many things that would ultimately come to that conclusion.
Also we dont know wether Shawn stayed in Tokio or not... the only thing we know is that Eri is bound to marry Shawn according to her father.
Someone has to confront shawn and Eris father in order for someone to be with Eri... remember that this decision was made by her father.
In the anime she told her mother she wouldnt accept that arrainged marriage... well if that was the case Eri's decision could've ultimately ended the whole Shawn thing, but it didnt.
Shawn appeared during the Tokio trip... and I think this is still unresolved.
Now who could impress Eri's father... or is there another way around it, or de we even have to mention the father in this case, I believe we do.
I dont think Max, could be the one doing it...
is karasuma, of couse!!