Seems like there's a missing column on that table? Where/when you can find them in order to fight/work for them to grind up their relationship points.
Viewing post in A guide for all the bois in the game
Marking down their locations was never a part of this guide.
Besides, most (all?) of them you will have to interact with for the main story. Don't think you can miss anyone in this game.
And when you see them once, you can always use the library place to fight them again regardless of their original location.