Okay Riot, here's how you can change Vel without really changing Vel
Change his passive from true damage to a stackable MR shred, **slightly ** lower the damage on his spells and their mana costs and lower his CD's. BOOM, uniqueness!
Now he shows the idea of learning about his enemies through lasers because he's finding their weaknesses and able to do more damage to them and he provides something unique to his team in that he's good for a heavy AP comp because he can shred the enemies MR for his whole team.
He'll do less damage initially without the true damage but he also has lower CD's so he can deal damage more often and if he can continue to stack his passive then he can not only increases his damage but increase the magic damage of his allies as well.