friend.
She lived inside his body, and somehow always had a whole bunch of tasty treats and fun things on hand.
She talked nonstop and had all sorts of weird check-in missions. She was seriously annoying.
"This week's mission is to bake cookies! *slurp* (whispering)"
"Three minutes of wild driving! The goal is to do five laps around the imperial capital! Jiang Yi, go go go!!"
"The Alliance Military Academy exhibition match! Aaaaaah, you did it! You dazzled the whole arena! You're so cool, my darling Jiang Yi!!!"
Jiang Yi, the darling in question: "."
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Only later did Jiang Yi learn that his System was actually... a mermaid!?
The day they met, she rushed over for a hug, her tail thrashing behind her.
"Jiang Yi, Jiang Yi, Jiang Yi! I can finally touch you!! Hehehe, you're so cute!!!"
Jiang Yi went stiff all over, the tips of his ears turning red.
"Don't say things like that!"
...You're the cute one.
An edgy, tsundere black cat prince with a very busy inner monologue
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A cheerful, straightforward mermaid princess who never holds a grudge
Theme: A perfect persona is great, but it's not necessary