Create 3D concept models for NPCs in a whimsical, post-apocalyptic sewer world. The art style should be shiny, gooey, and organic, similar to a radioactive blob character with a gradient green-to-yellow color scheme, large expressive eyes, and a playful yet slightly eerie vibe. Design a variety of NPCs, including: A mutated sewer rat with a slimy texture, small limbs, and glowing eyes, holding a tiny tool. A humanoid sludge creature with a hunched posture, dripping appendages, and a mischievous grin, wearing tattered clothing. A floating jellyfish-like entity with bioluminescent spots, translucent body, and tendrils that sway, acting as a guide.

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