Keep it civil, do not flame or bait other users. If you notice anything illegal or inappropriate being discussed, contact an administrator or moderator.
Hi there-! The first season of Darker than Black was pretty good to me, but i don't know if it's really really what you're looking for. Black Lagoon is gold (even if it's kinda femdom-ish). For crime stuff and awesome characters i suggest you Monster but i've read the manga only. Maybe Ergo Proxy can suit your tastes.. and i bet that you already know about Death Note. Then i feel like i should suggest you XxxHolic but i fear to go out of your line. You didn't mention supernatural but i hope that it won't bother you and that you'll enjoy some of these series even if they can't beat Boku no Pico. *add an important lol here*
These do not match your request 100%, but they come close, and are good.
Monster - Japanese doctor saves the life of a serial killer, and regrets it. One of the best, longest series that I have watched. Highest recommendation. www.youtube.com/watch?v=n86hgIXc1BM
Dennou Coil - Basically, Google Glasses the anime (before Google Glasses). One of my favorites. Highly recommended. www.youtube.com/watch?v=Kt3tKHRrjWw
Kino no Tabi (Kino's Journey) - A traveler and a talking motorcycle travel from land to land, observing the culture and staying for exactly 3 days in each place. Philosophical, but not pretensions. Highly recommended. www.youtube.com/watch?v=ZVgHN8cfy1I
Majin Tantei Nōgami Neuro - A demon detective and his high school assistant solve supernatural crimes. Some comedy. www.youtube.com/watch?v=WbHn6kJSrxU
th8827 said: Monster - Japanese doctor saves the life of a serial killer, and regrets it. One of the best, longest series that I have watched. Highest recommendation. www.youtube.com/watch?v=n86hgIXc1BM
Yo, sweet honey. I've already suggested that series with all of my kokoro, stay out of my territory. *hates you forever*
By the way, i'll add Nyan~ Neko Sugar Girls. I know that it has nothing to do with what you said, but you're going to watch it anyway. m.youtube.com/watch?v=pupTowgpVVo