One interesting Rickon Stark fanfiction could be where he survives and returns to reclaim Winterfell in a more powerful way. He might have been trained by some secret group during his time away, and he comes back with new skills and knowledge.
Arya Stark could also be a good pairing. They could team up and take revenge on those who wronged their family. Arya's skills and Rickon's new - found strength could make them a formidable duo in the fanfiction world.
Tony Stark has met his demise in some comic versions. But keep in mind that comics often have alternate realities and potential resurrections or different story continuations.
Rickon can be developed by showing his growth from a young boy to a more mature individual. He could start as a naive child but gradually become more self - reliant and brave under Osha's influence. Osha, on the other hand, can be developed by delving deeper into her past. Maybe we learn more about her life before she came to Winterfell.
One possible plot could be Rickon growing up under Osha's protection in the wild. They might face challenges like finding food and shelter, and their relationship could deepen as they rely on each other. Another plot could involve Rickon learning survival skills from Osha, and as he gets older, there could be a budding romantic tension between them.