Scrub Tier Question on Spritesheets

[GiftsBeerIceNice]

Hello! As part of my final ICT project at school, I want to make a Fire Emblem style game that uses sprites from a sprite sheet that has a lot of extra garbage that I wish to ignore. I would like to support animations as well, I can't remember for the life of me where I got the sprite sheet from, so suss it out on imgur https://love2d.org/imgmirrur/39RZ9JF.png. To be specific, I'd like to load the red and blue units on the top row and a little further down with the top row of the griffons, then the great knight then whyverns etc. I have a lot of sprite sheets, is there any way I can do this easily? Maybe a quad + 'AnAL' (jesus christ the marker's gonna think I was responsible for the name) combo?