as someone thats on the spectrum, i'm looking for a manga that has a character with the autism. any suggestion?.

The only one I know of is Hikari to Tomo ni... (published in English by Viz as "With the Light"). I have been planning on reading it for a long time now, but I haven't gotten around to it. There is an autism tag but I don't think there's a lot that's tagged with it (and even fewer that use it seriously).