All my Kuddles
Seriously though just got round to completing Komari route. Can't wait to play around with the other options
Edit: another note to add is I came across what these stats work for in the game, use full to anyone;
For Baseball
Arm Strength - Affects pitching power and speed of passes and distance of balls hit
Body Strength - Endurance. Characters without a lot of it will perform visibly worse as the match drags on
Agility - Affects success rate for outfielder catches and running speed
Reflex - Affects success rate for infielder catches and accuracy of hits
Concentration - Affect the success rate of infielder catches (it's more like it makes the character less likely to miss a catch), as well as accuracy
Judgment - Affects general intelligence of actions (less bad judgment in who to pass to in defense, and less not ignoring balls and end up getting triple played like poor Tomoyo), chance of catching a ball in the outfield before it hits the ground (err... what's the name of that again?), and chance of stealing bases according to someone on KeyFC)
In Battles
Arm Strength - Determines damage for strength-dependent weapons. It's really useless in the ranking battle, but it's useful in Rin's barehanded fights against Sasami & Co. and those mystery creatures.
Body Strength - Reduces damage from strength-dependent weapons, has a minor effect on HP, and chance to block attacks (not evade, block)
Agility - Turn order and evasion
Reflex - Accuracy, Evasion, and Counterattack rate
Concentration - Accuracy, Critical, Block
Judgment - Not really sure, I think a little of everything
Luck - Criticals definitely. I think it has an effect on stuff like dices, but I almost never get that weapon so it's hard to confirm.