I can't believe Overkill haven't put Nick in the game yet. Especially if this mod is out, which means the work has basically been done for them. Even if the voice actor for Nick isn't available I bet you could find someone with a very similar voice and really it wouldn't be too bad because we could just assume that post apocalyptic Nick has go thru some changes.

Nick's backstory would work perfectly for Payday. I even thought of stuff for things like the Perkdeck. Here are some examples.

"Not the suit!" Enemies killed at close range that get blood on Nick's suit will trigger a 10 second rage which increased damage by 100% and it cannot occur more offten than every 10 seconds. So you'd kill an enemy near you, do 100% more damage and then have to wait 10 seconds before you could do it again.

"Show off" When not wearing armor you gain a 10% boost to your armor and 30% armor regen regardless if in combat.

"Efficient healer." Nick knew how to use medical supplies like a pro even before the infection. This one is a big complex so let me break it down. Let's say you have 100 health and take 90 damage. After you heal you will get all your health back but as we all know, in Payday 2 when you heal you'll get full health regardless of your health meter. So that 90 damage you took, now you have 10 health. After you heal you'll go back to 100 health, but here's where the perk kicks in. You gain a sort of "1 up." So when you take lethal damage, instead of dying, you will get back up immediately with 10 health because that's the amount of health you had the first time you healed. So basically, if you had 90 health and healed for 10 health, you would "1 up" with 90 health. I don't think this skill is op because it's suppose to be top tier in the deck and uses 1 of only 2 charges in your medic bag unless they have the skill meaning you'd only be able to legit heal one more time.

A$$ Clown" This perk is pretty useful but not overpowered, the gist of it is that you get more money the less useful your team-mates are. Because who can blame you if your team mates are A$$ Clowns? So if you have the most kills then you would gain 5% more XP and money when you get payed and a .5% higher chance of getting an Infamous item on Payday. This stacks with other things like, if you complete the most objectives, heal the most team mates, take the most damage.

So Nick isn't really much of a dodge character. He should be used armor, but in cases when he has non he will get a boost.

I also think if they put in Payday 2 that he should have his own Melee weapon like every other character. I think the best weapon that they haven't added yet would be the Golf Club. "Nick's Nine Iron" has a certain ring to it anyway. Fairly high attack speed with medium damage and high knockback.