Thunderbolts by Warren Ellis #1

This 2008 Marvel hardcover collects Warren Ellis's acclaimed run on Thunderbolts, bringing together one of the most unsettling rosters in the team's history. The cover art presents a striking ensemble — a pink-and-white-haired woman at the center clutching a blade, flanked by a red-costumed figure, a gold-armored character, a spike-shouldered dark warrior, and a symbiote-faced figure lurking at the edge — conveying a group that's dangerous, volatile, and compelling in equal measure. If you've ever wanted morally complex characters handled with sharp, sophisticated writing, this is a great place to start.