IM A BIG OZASA SHIPPER. it's my second favourite mhyk ship! their relationship is so interesting to me and i don't REALLY see them as father and son..? i dont know how to explain it but if you like hetalia they're as much father and son as USUK are, which is not really (like, what is a non-blood related relative when ur that old? how do ur relationships morph and change over hundreds if not THOUSANDS of years?? does that person you raised stay a child forever?) anyways oz/arthur nation plz rise!
i also like cain/arthur but :3c.. i dont rlly have much to say on it since ozasa fills my thoughts

As for cain this is a pretty basic answer but i like owen/cain. its not something i ever rlly seek out content for nor am i crazy about their relationship but i do think its interesting and the smut is good lol (though i seems like im in the minority with my shipping order..)

omg and sweet sweet rutile. i ship him with mithra! i think rutile/chloe is pretty cute but im not fond of ships JUST for being cute so i think i need to consider their canon interactions a little more... (also i ship both of them a lot harder with other people lol)