Hello, what do you think the ideal personality would be for Irimi’s s/o?

Oooooh. I can see two ideals.

One is the Enji-Koma type. Wisecracking, not too serious, but with a sober and empathetic heart. They would have a teasing relationship, peppered with late-night, soul-wrenching conversations. 

The other type os a quiet, gentle soul. A Hirako Take type, if you will. Regardless of species, accepting of Irimi. Admiring her. Introverted and committed to learning alongside her. 

The one ideal both must have is a love for dogs.