I checked the site but couldn't find an answer to this question : I know knockback damage is separate from damage from the attack but is knockback damage considered to be damage from the character? I ask because I was wondering, say my character (character A) rolls doubles and knocks an opposing character (character B) into a wall. After damage from the initial attack is taken, character B has toughness when he hits the wall. Would character A's armor piercing have an effect on the knockback damage?

Armor Piercing: Damage dealt by this character may not be reduced below one.

it is not.
it comes from hitting the wall not the character that caused Knockback.

Okay, thanks. Consider yourself repped.

Just backing this up- this is from the FF rulebook: