Does the sword of antiheroes count your characters too. Says plus one strength and attack for every character in base contact
No, in the rule book it states that the bearer has +1 strength and +1 attack for every enemy character in base contact. Hope that clears it up. Welcome to the forum by the way!
I think that the BRB FAQ clarifies that a model is never in base contact with itself, as well (because a mode's edge cannot touch its own edge).