I did not remember any repeats in Challenge Events. However, if it makes you feel any better, Scorpion isn't that good... the burning/bleeding is for like 2 seconds and his attacks are slow. My problem is with ARKHAM HARLEY QUINN. I BOUGHT THE CONSOLE EDITION TO GET HER AND SHE IS WEAK STAT-WISE AND POP POP IS THE STUPIDEST ATTACK EVER!!!!!!!!?????

To the Nightwing comment, it is because of his silver and bronze abilities to cut down on enemy basic damage (Abilities like hand-to-hand combatant.). If he was faster, he would be much better and have an unfair advantage over his fellow characters.