Hikari Hamura, nicknamed Picasso by his peers, always has a pencil and sketchbook in hand. Though he used to spend most of his time with his only friend Chiaki by the river's edge, things changed for the boy forever when a helicopter crashed on top of them, killing Chiaki and leaving him virtually unscathed. Upon awakening, Hikari is told by Chiaki's spirit that he is alive because she prayed for his safety, and in return, he must help classmates in need with the power of his sketchbook, or his body will rot away. Now, with the help of his angelic partner and his artistic skills, Hikari must help save his fellow students, gaining plenty of friends along the way.
Recently died and have unfinished business? The Kurosagi Corpse Delivery Service is your ticket to a worry-free, eternal rest! Made up of spirit communicator Kuro; embalmer Keiko; leader Ao; body dowser Makoto; and Yuji, a boy who communicates with aliens through a hand puppet, the group handles everything from suicides to murders with ease. Whether you need a message delivered or want vengeance for your death, the Kurosagi Corpse Delivery Service can help you out - for a price. And while the team often has to end up working on a volunteer basis, they'll still get the job done with a sarcastic smile!
Both center heavily on the themes of death and helping others. While KCDS is much more grim in places, both series have a comedic streak and can be very heartwarming at times. If you enjoyed one there's a good chance you'll enjoy the other
Another mostly-episodic manga about a high school loner (by choice). Genkaku Picasso's Hikari cares more about his art than any person, and the titular Kanoko loves researching and observing her classmates, but would rather not interact with any of them. However, something always goes wrong and the two begrudgingly go about righting other people's personal problems with their unique gifts (of art and observation, respectively).
Both are well-written, with charming characters and interesting situations. Definitely recommended.