ExploderWizard
Hero
Here's the thing - most of the time in actual play the character's role is fairly loosely defined and there are often multiple decisions that make sense for a character in a given situation. I'd also argue that barring story concerns we're still concerned with stuff outside of a character's role like beating tactical challenges, giving other players a chance to shine, not being a dick, etc.
A player can be kind, show respect for others , and engage in tactics all from within the role. The tactics part can be more difficult if the best tactical options have no meaning to the character.
Playing in character should never be used as an excuse to be a turd towards other people.