A few more recommendations:
Baccano!
Baccano! tells the story of a group of alchemists who meet in secret in 1711 aboard a ship called the Advenna Avis where they are gifted with an elixir that grants immortality by a demon; they then split up to travel the earth. We follow them through a series of nonlinear stories as they encounter one another again and again across the centuries, with most of the show focused on an escalating conflict between rival mafia families during the Prohibition in New York City where the immortals and the elixir surface again and shenanigans ensue.
This is like, easily in my top ten favorites. The score and the way the story is told are fantastic, the cast is large and interestingly eccentric, and the action and occult elements are just fun.
Pet
Hooboy, Pet.
It is an incredibly heavy and dark story about a criminal organization that uses psychic hitmen to either manipulate memories or cause mental breakdowns and catatonia in their targets. This is another one that is hard to say much about without giving too much of the story away, but it is complex and just...a lot. The visuals are amazing, as the show takes you into the psyches of the victims and the psychics, it's very surreal.
There are some elements of the plot that are very troubling, if not actually triggering, and so I'd say be cautious with it. But it's worth the watch, and lingers with you for quite some time.
Inuyashiki
This is an intense horror/sci fi anime that follows the lives of an elderly salaryman and a teenager whose bodies are accidentally destroyed by interdimensional aliens, who absolutely panic and proceed to replace them with super advanced cybernetic weapons platforms and then just...bail. The teenager, who was already mentally unstable, blossoms into a terrifying psychopath and the old man is forced to try and stop him.
It's a genuinely bizarre show, and very graphic and unsettling, but still worth the watch imo. The old man in particular (the titular Inuyashiki Ichiro) is such an unusual protagonist and you develop so much sympathy for him over the course of the series as he slowly learns to become a hero, and what that actually means. Plus, there's a scene where Ichiro is trying to activate this jetpack built into his torso and he can't make it work until he starts singing the old Astro Boy themesong to himself and C'MON THAT'S JUST ADORABLE, you'll wanna pinch his wrinkly old man cheeks!!
Parasyte
SPEAKING OF UNSETTLING BODY HORROR.
This is another show that is in my top ten, and is just amazing. It's an Invasion of the Body Snatchers-esque story of these little, well, alien parasites that burrow into people's heads, eat their brains, and take over their bodies -- only one of them fucks up when it tries to snatch the body of high schooler Shinichi Izumi, who traps it in his arm where it is forced to adapt and possess his hand instead.
They slowly become uneasy allies in the fight against the other parasites, who are infiltrating society and snacking on people. It's tense, incredibly gory, very creepy, and explores what it means to be human. I love it.