Reddit mentions of Summer Knight (Dresden Files)

Others have suggested older lore sources for fey pact, but there's recent as well in the Dresden series with Mab (see Summer Knight and Cold Days)

The Ex-Heroes series is a personal favorite. great character development and really clever power usage. When you figure one of the villains powers you have that "Oh shit it was there this whole time and I didn't notice it!" moments.

Later on in the Dresden Files Harry Dresden has his own Rouges Gallery, sidekick, and car named the blue Beetle. He has the luck and mid-battle banter of Spider-Man and as many allies as the X-Men but fewer true friends.

There's a lot of power crawl and he struggles with morality and fighting a never ending battle against evils that most of the world doesn't recognize while getting no respect.

Seriously, Dresden Files is my favorite thing maybe ever and I try to convert people to the light whenever I can. The books started out a little rough but started getting really good with book three but book four is also a great place to start. I'm not exaggerating when I say the series gets better and better with each book. The third acts always manage to leave me on the edge of my seat and then the next one comes along and blows it away. Sorry for going on fore awhile but I fucking love the Dresden Files.