A really good addition which I made clear to everyone was as well as power cards I wrote an extra card for people which basically went. Schnee the Necromancer, you are a vile necromancer capable of manipulating dead flesh and bones with magical powers and rituals if you want to do anything along these lines blag the DM.
Meep the Werekobold, you are nimble and quick an expert climber in your lycanthrope form and more than competent with the set of Thieves Tools you carry on your person when in kobold form, anything you want to do along these lines blag the DM.
Everyone got one of these according to how they presented the character to me and how they wanted it to play, it took the characters minds away from just using powers all the time and really added to the roleplay and theme of the characters and if I ever run a campaign I will be making it abundently clear that I want improvisation of the same order.