All of the other mercs released so far have had some substance to their backstory. Proxy survived the Dirty Bomb by improvising protective gear, Aura wanted to become a merc to test out the medical equipment she invented in the field, Vasilli purposely botched an assassination job on his sister, etc.
Then you have Arty, whose profile basically goes “This guy is a merc, he likes money, and uhhhhh… there’s not really much else known about him. Mysterious right?!” Sorry, but way to make a dull merc even duller. You can tell the writer the writer scrambled for this before the due date. I’d love to see an improved backstory for Arty that actually ties his personality to the Dirty Bomb universe.