I will sometimes consider the aspects of a character's life that I don't see or the things about the character don't quite fit. I look for frayed edges that I can worry at to see what I find. Throwing a character into a situation that canon never did also works.
Ensemble canons tend to give snapshots of a character's life so that one can work in the lacunae. In this case, are there any bits of canon that preclude the character interacting with a pet or having to watch his four year old cousin? Has the show defined his entire family? Could there be someone in his past (a grandparent? a neighbor?) who showed him how to weed a flowerbed or took him on a weekend camping trip? Lives are made of a lot of small moments, and nobody is all one thing, all of the time. Maybe he recorded every episode of My Little Pony, and that's his most shameful secret?
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Ensemble canons tend to give snapshots of a character's life so that one can work in the lacunae. In this case, are there any bits of canon that preclude the character interacting with a pet or having to watch his four year old cousin? Has the show defined his entire family? Could there be someone in his past (a grandparent? a neighbor?) who showed him how to weed a flowerbed or took him on a weekend camping trip? Lives are made of a lot of small moments, and nobody is all one thing, all of the time. Maybe he recorded every episode of My Little Pony, and that's his most shameful secret?