Shiryu is my favourite! Apart from when my favourite is Shun. Actually, that's not true, my favourite is generally Shunrei. She can pray harder than Chuck Norris could punch when he was still The Guy.
But I would always send Seiya on missions of loving someone over to the side of Good (which Junzo seems to need), because even if your soul was not touched, he would annoy you so much by his continued efforts that even the meanest meanie would surely eventually give up and say FINE OKAY, and join hands.
And hopefully before he succeeded, he would get punched through another pillar.