Hey there!
I think having cool character customisation options is great, as you can bring out some cool personal touches to your character. I'm not sure how Identity's character customisation interface will look like. I'm thinking of three options. The first is a Sims 4 style clay moulding type interface for sculpting the face and body. The second is using a similar system shown in APB Reloaded. The third is similar to EA Sports (FIFA) for a combined preset and custom options readily available.
Feel free to comment or suggest other ideas which I haven't mentioned!