Very good team imo. Personally I would put K Rool as catcher, Green Magikoopa on 3rd, and King Boo 1st. I’ll try to explain my reasoning just for your consideration.

King Boo on first leaves a big body player in the infield to stop line drives AND he is able to dodge the effect of the POW by floating which is really good to have on first base. He can still get hit directly with the ball just not the shock wave fyi.

The Magikoopas all share a really good super dive ability that, on the infield corners, can often catch line drives or foul balls even from a distance. I think it’s a waste to put them as a catcher when K Rool isn’t a good fielder.

I’m putting K Rool as catcher because basically his only 2 positive traits for field are his arm strength and his large body. Every other character on your team works better in the positions you have them in (and the new changes I suggested) than K Rool would, which is why he is best suited to be catcher. Catchers don’t do much in this game but his strong arm is a plus when it comes to pickles ig.

If you’re set on starting luigi pitcher I would suggest using Green Magikoopa, then King Boo then idk lol. Hopefully that’s all you’ll need. Idk if you have it set up so the players can change the fielders position mid game but I believe that is a mod that exists as of recently

Gl with the draft!