A lot of people call cards or heroes in gacha games "toons". His "toon" is his ballplayer.
OP: Yes picking a class before each game can help based on what the situation is. Maybe they're bringing you in to close a game..pick a class that would help with 9th inning clutch pitching...
Or maybe theyre bringing you in to hit lead off, then maybe you want to pick a class that you set up that includes speed, stealing, contact, etc.