I get a kick out of shows that intentionally make characters look strange, shadowy, or downright grotesque — and there's a healthy list of cartoons and animated series that lean into dark palettes and odd designs. By 'ugly dark-colored' I mean characters whose color schemes, textures, and anatomical proportions are deliberately unsettling: slimy greens, inky blacks, mud-brown hides, or patchwork skins that designers use to signal otherness or horror. This aesthetic showed up a lot in 90s and early 2000s Western cartoons where creators embraced gross-out humor and surreal body horror.
If you want a straight-up catalog: 'Aaahh!!! Real Monsters' is the poster child — those three school-of-monsters protagonists and the faculty are gloriously ugly, with heavy dark tones and exaggerated features. 'The Ren & Stimpy Show' made a career out of hyper-detailed, revolting close-ups and splotchy palettes. 'Courage the Cowardly Dog' is stuffed with nightmarish creatures and grotesques that use darkness and texture to feel truly uncanny. 'The Brothers Grunt' and the early MTV short-era cartoons also wallowed in repulsive, mud-colored character designs. For a darker, gothic vibe, 'The Grim Adventures of Billy & Mandy' and 'Beetlejuice' the animated series throw together skeletal, shadowy characters that read as intentionally ugly.
If you're open to adult or more dramatic animation, 'Dorohedoro' (anime) is a must — it's covered in soot, grime, and mutations, with characters who look brutal and battered rather than conventionally pretty. 'Spawn' and 'Castlevania' (particularly the latter's monsters) revel in blackened, scarred, and beastly designs. 'Over the Garden Wall' is a nice counterpoint: the Beast is a brilliantly dark, simple silhouette that feels ugly in a mythic way, not just grotesque for gore's sake.
I love these shows because they remind me that animation isn't just for pretty faces — it can be a playground for discomfort and creativity. Ugly designs often stick with me longer than pretty ones, because artists take risks with texture, shading, and form. Whenever I want something that makes my skin crawl in the best way, these series are my go-tos — their nastiness often hides a lot of heart.