My kids have always both had fairly "typical" special interests. For them, it is more a "degree" issue than it is an "odd" issue.
Son: Minecraft, Bleach (the anime kind, not the cleaning kind), wolves, and swords of various types
Daughter: Minecraft, Pokemon, drawing (may create up to 20 very detailed drawings in a day), anime, and chibis. She has created her own Pokemon regions with her own Pokemon. My son says many of them are better/more creative/more exciting than the real things.
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Mom to 2 exceptional atypical kids
Long BAP lineage