[quote=@Holy Grail]
[u][i][b]Third Idea[/b][/i][/u]: This one might be the most odd, but if it's rejected i will not argue. What about...a Minish OC? 

They could be from a pocket of Minish that stayed when the door to the Minish world closed at the end of the Minish Cap came, desiring to live in and stay in Hyrule. Living in Hyrule's Castle Town through the centuries even after the forest some of their people once called home was lost, this group of Minish composed of all kinds of Minish who gathered there after their other homes were destroyed or changed over time by other events would have moved with the Hylians as they moved from place to place. The magic that kept them invisible to adults began to fade away and eventually disappeared over time as well, leading them to become more reclusive from Hylians and humans as a whole in order to help preserve their people over time.

The OC themselves would be a Minish who has learned magic from one of the last members of his kind to have been trained in and honed in the art of it. Rather than combat magic, this magic would take the form of general utility magic and especially a form of "size-altering magic" to allow them to alter the physical size of themselves, objects, and even other living things if the need arises. This "size-altering magic" could have originated among the Minish still remaining in Hyrule after the stumps they used to change size back during the time of Minish Cap were destroyed and became effectively nonexistent over time. Further, the OC could sport general utility, medicianal, or other support skills on top of some skills with a sword or other weapon in order to help them fight and not smiply be a hinderance to the group as a whole. However, they could play a support role as a whole for the party of characters, being educated and intelligent as well. 

This OC could also be male or female, and after having dreams they use size-altering magic to grow to human-child size or such in order to set out on a journey to the graveyard. This is probably the strangest of my three ideas, perhaps the greatest stretch. Even so, i would hope this sounds more feasible than the time-defying and other hard ideas you mentioned before! 

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Hi, co-GM here. In practice, the Minish are a pretty bad idea for a character. It's not a huge stretch lore-wise that there would be Minish but for one, the Minish can only be seen by children not because of their size, but because of the good-naturedness and innocence that only children have. Even with weird size changing magic you'd only be able to interact with at best a very small portion of our cast and the vast majority of NPCs just wouldn't see you at all, something that would be very difficult for us to deal with as GMs. It's not that it's an outright lore problem for there to be a Minish, it's just that it doesn't shake out well in practice.

Why would you want to make a Minish bigger anyway? The cool thing about em is that they're small and even the simplest stuff is so huge and crazy for them. Why would you want to take that away from them and make them basically another weird little imp-like thang hanging around? Sure you might be able to get some interesting "woah bro, shit's so different when you're normal sized!" reactions at first but it would get old quick and given the problems that arise with most people not seeing you it wouldn't be worth the trouble. Gonna have to take a hard pass on that one.