More to be filled in at later dates. Comment if I forgot you or you want to be added! Chart to come later as well.
Rena
One of Keiichi's best friends from Hinamizawa and the first person he saw in Somarium. Much like back home, Keiichi is pretty close to Rena. He is willing to do anything to help her and knows that she would do the same for him. Being away from Hinamizawa, they are constantly keeping eachother from falling off the edge of reason and sanity.
As it is, spending lots of time alone with her in Somarium is slowly making him believe he may like her more then a friend. Although whether he would actually admits this and tells her or not is another story.
Spain "Antonio"
One of the many people Keiichi met when he first arrived in Somarium and probably something like a best friend to him now. At first he found it rather weird to be talking to a country, but now it seems like he kind of forgets that he is one. If Keiichi needs help or someone to talk to he knows he can count on him, and the same goes vise versa as well. After all, Keiichi is the type that would do anything for his friends in general.
Rise
Fro the most part, he really values Rise's friendship. Keiichi really loves having their "teasing wars" with her and just randomly talking as well.
Atoli
To be filled in later
Kallen
To be filled in later
Rita
Meeting Rita for the first time could have definitely gone a lot better. However, after talking to her a bit more he came to think of her as a good friend. If anything, he loves poking fun at Rita's tsundere personality as it reminds him a bit of Mion's.
Lavi
Lavi is probably the coolest guy Keiichi has met so far besides Kamina. He loves that fact that someone in Somarium shares his interests and finds what he did for a living awesome. With all this though, he has a slight gut feeling that Lavi is hiding a lot but is not going to push on it. Keiichi figures he will if he feels like and chooses not to bug him about it.