Mario is good for any team. I like to put him at third base. Though he's basicially good anywhere, rthough 3rd is probably his best spot, with his somewhat strong arm. He also would make a good LF/RF.
Luigi, like Mario is a good addition to your team. I normally play him in LF, being that his arm is good, and he has decent speed. Though his good arm would also be good for RF.
I don't use Peach, unless I have to, and if I do, I normally put her in as a pitcher. SXhe'd also likely make a good LF/RF.
Daisy makes a good at 1B, and she is good at LF as well.
DK makes a great pitcher. If you have someone better, opr don't like him there, he'll be decent at catcher or 1B
Diddy is good at SS & CF. He is fast and can make good plays.
Yoshi will always play SS. He dominates there. If You don't like him there, The OF or 2B is fine too.
I normally don't use Birdo, though she's normally decent playing catcher, 3B & 1B Though normally you could find someone better.
Wario is a total slug, making him most appropiate for 1B and maybe catcher.
He's only good at pitching, so that's what you use him for, but Bowser or Boo would be more useful on the mound, so I wouldn't bother with him. He's a good slow pitcher, but morst people prefer fastball pitchers.
Bowser is an exellent pitcher, and if you like someone else there, 1B or catcher is suitable.
Being swifter and a lesser pitcher than his dad, Bowser Jr. is good for 1B, 2B, 3B, C, and LF. Though you could probably find someone better.
Koopa is too decent to be useful, if you are a big fan of the turtle, put him anywhere except SS, CF, and P.
Faster than his ground-bound counterpart, h's best suited for LF & RF. If he doesn't cut it there, don't bother with him.
He really isn't that great, like Koopa, put him anywhrere but SS, CF, and P
I always use Goomba, being a big fan, and normally at 1B or C, though there are much player players for those spots.
The only speed player who isn't fast. Basicially useless, if you don't have anyone else, put him in LF or 3B.
Like Goomba, though switch C with 2B
I like to use him, though he's tougher to make contact due to his odd bat, but he's okay for 2B & LF. Though you'll likely find someone better.
Good for CF, SS, and 2B. I would either use her as a leadoff, or 8th or 9th batter, being poor at batting.
Monty will likely play in the OF and Middle Infield. Though you'll likely find someone better. Not that good of a hitter either.
Super Fast, so SS or CF here. LF & 2B is you have someone better for those two positions. Not a great batter, pt her 1st or last in the lineup. If you have Dixie, you won't want Toadette, or vice-versa.
I like Boo as a pitcher. If you don't want him there, don't bother with him.
Shove him in 1B or C. MAYBE the OF or 2B but that's if you're desperate for power. And even so, there are bett Homerun guys. I don't suggest him strongly.
He makes a great catcher due to his strong arm, though too sluggish for an OF spot. You can put him at 1B too if you like.
Possibly the worst power guy for power, but he has a deccent arm, though too slow to be good anywhere other than 1B, and by now, you'll know of someone better.
Very fast, okay for 2B or OF, but not that good, so I wouldn't use it.
I don't know how good he is, being that I've never used him, or unlocked him for that matter, but from what I understand, you can change his color, and he'll become a Boomerang Bro. or a Fire Bro. I like him, so I'd want him on my team.
Like a lesser koopa, byb putting him there, you're basicially putting in an auto out.
LF and 2B, though there are better.
His speed makes him better than BM, but there are better.
Doesn't make many errors, though takes forever to through from the outfield, so I wouldn't reccomend him for most teams.
I hope you liked my guide, and good luck in Mario Superstar Baseball.