I thought of this a little bit ago, and I thought I'd share the idea, just in case it appeals to someone, such as upperdeck...! And maybe, forum members might enjoy!

Kingpin
The Kingpin of Crime
Team: Synister Syndicate (Or whatever team he becomes)
Cost:0
Atk: X
Def: X

Boost X: Kingpin's Attack and Defense equal X. When you recruit Kingpin, search your deck for a Synister Syndicate (Or whatever team he's on) character card with the cost X, and put it into play in your front row or support row. Shuffle your deck afterwards.

"Yes, I believe he'll get the job done... For our asking price..."

You could restrict it some more by saying you cannot play anymore plot twists this turn, or something, to make it a little more playable. But, I had some free time, and I figured "What the heck, they might even like it!" Everyone can post their comments/ideas about it if you like! Enjoy!

You could make it that you look through your deck and find a character with his team affiliation and put it under kingpin as an equipment.