I hope it’s Atalanta she is very cute, could fit in with the nekoshou and despite disliking men she does like children, so it’s basically now or never while the mc is a child.
Since he is already have medea as long range fighter and himself as front-line fighter i suggest tanker, in this case shielder, so summon Galahad or you can opt to create assassin squad, thus you can summon King hassan or other hassan i sabbah servant
P9G