Goemon Arakawa's Links
Heiza is his half brother. Although they spent a lot of time together as young kids, after some time the contact became scarce. He's rather fond of him and likes to hug and dote on him, even though he knows that it gets on Heiza's nerves.
Heiza doesn't like admitting that he likes his elder half brother, but still falls back onto his support and help the moment he reappeared in his life. The two get along rather well regardless of their personality clashes, as Goemon is able to handle Heizas anger outbursts pretty well and knows how to easily calm him down.
Souma's half cousin. He personally likes him and thinks of him somewhat of a distant elder brother.
He thinks of Goemon as a trouble-maker and has his reservations regarding his status within the family, but still he sees him as family and is positive to neutral towards him. He does not reject anyone of his family clan.
His friend with benefits. Like the rest of his family, Goemon thinks Daichi is a cute puppy. And that he's quite attractive. And good in bed. Together, he's his calmer half and keeps him in check. Since their friendship (with benefits) is far distance, they have to resort to messaging for communication, but that doesn't stop them from engaging in... things.
A friend with benefits, but also an actual friend. Daichi enjoy's Goemon's company and is always happy to be around him. He cares about the man on a personal level and will be beside him no matter what... as bros, of course. Obviously.