Originally Posted by
J. D. Guy
Rebirth's Green Lanterns during the 1st half as written by Sam Humphries. Not so much after he left, but it was excellent prior. It did wonders for both Lebanese-American Simon Baz and Hispanic-American Jessica Cruz, as heroes, as a duo and on personal. familial levels. Simon's New 52 origin and backstory was also well done.
People cite David Walker's DCYou run on Cyborg, but I also extend that into John Semper Jr.'s run in Rebirth. Both writers provided things for Cyborg that he needed, in spite of any constraints they likely had while doing so. I'd say the definitive version of modern Cyborg lies between the culmination of these two runs (and maybe early Justice League: Odyssey). Honorable mention to Kevin Grevioux's short 2-something issue contribution.
We Are Robin for Duke and his compatriots (of their team of 5 throughout the majority of its run, there were 3 different persons of color), and Batman and the Signal for Duke in particular, as short-lived as the latter was.
New-Superman, and by extension, its natural evolution of New-Superman and the Justice League of China. This book written by Gene Luen Yang was superb. It lasted for a time compared to some of its contemporaries, but it was still most certainly short-lived. It deserved to be a perpetual mainstay, as far as I am concerned, doing its thing and expanding the team's influence and resume.
Jaime Reyes' Blue Beetle. I found something to enjoy in most of his runs, and his first, pre-Flashpoint one is often remembered fondly for how it fleshed out Jaime and his immediately family and friendgroup (Paco and Brenda).
The New 52's Firestorm Nuclear Men, prior to the re-tool halfway that "went more traditional), was excellent in my eyes. It was adding to the Firestorm mythos while being excellent studies for both Jason and Ronnie. Jason was at his peak then; he was superbly smart and studious, but he was proactive (not passive, though he still had his doubts and worries) and didn't take mess from anyone, not even Ronnie in his more "jock-ier" moments (young man was woke). It helped that both could become their own Firestorm, again, before the re-tool.
While also short-lived and not some kind of explicit study on diversity, I loved Scott Lobdell's Doomed, which featured a lead of color (never did have the time to explore Reiser's ethnic background), along with a subplot with his roommate who was gay and was dealing with a superpowered form he couldn't control of his own. Then there was Reiser's love interest, who we couldn't delve into as far as her true role was concerned.
These are what come to mind for me for now, but there were other series that were diverse in their leads and stories that I enjoyed (Midnighter was fun, and I loved Batman and Robin: Eternal, for a couple of quick examples). If more come to mind, I'll probably post them then.