FAVES: Ryunosuke, Kazuma (or both as a polycule)
YES: Albert, Stronghart, Klint because I'm problematic, Genshin, Esmeralda
WITH PRIOR DISCUSSION: Sholmes, Susato
NO: Gregson, Iris

Open to ships other than the ones listed, these are just what come to mind first. M/M and M/F are both good, though I kind of lean more toward the former since all of his major relationships are with men.