Mine is Ace, because its funny. My friend gave it to me before i came out as asexual, so i kinda internally giggle whenever i hear it
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Mine’s Mouse, its been my nickname since i was little and i actually use it as my name, i barely recognise my actual name being called at the doctors or dentist 😅
Im not sure why im Mouse but i like it, i think it’s because im really small and have an embarrassingly quiet high pitched voice