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Imagine
> Older sister of a rival that behaves like Lear from Pokemon Masters
> Stacked, Cute face, sidebang, basically 13/14 year version of pic related.
> Personality similar to Lana's mom and Delia
> Has a lot of suitor fighting for her hand in marriage.
> Meet Ash to apologize for her brother's rude behavior.
> Acts as stand-in mother figure for the rival due to having a dead mother.
> Ash dots on her due to her mature personality, ladylike behavior and cooking but dislikes her brother.
> Due to poor wording and some interference, she thinks Ash has a puppy crush on her which she at first found cute but wanted to let him down gently.but Eventually starts to develop feeling for Ash.
Now that I think of it, Gary had a big sister in the game that never appeared in the anime and now its too late due to Ash and Gary settling their rivalry.