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I don't know much about Lisa's backstory but I do know that she's a powerful mage. I also know that she was the first ever to graduate at the top of her class in 200 years. Another thing I know is that she loves and respects literature a lot since she learned everything she knows from books. Lisa knows lots of forbidden secrets about Teyvat that no mortal is supposed to know. Her vision is electro and she once read a forbidden book that shortened her life span by half. After traveling the world she returns back to Mondstadt which is the Land of the Free and is ruled by the Anemo God, Barbatos. There, she becomes a libraian and runs the library that all the citizens go to.
Lisa is an flirtatious, intelligent, and powerful indiviual. In the game we can tell that she takes a liking to the traveller and gives them the nickname'Cutie'. She also takes them on a quest with her to retrieve some books that the citizens didn't turn in and it sort of had the set up of a date.
Lisa is a well-liked character throughout the genshin fandom. She's also respected by the citizens of Mondstadt and the other Knights of Favonius. Lisa is friends with citizens and other members.
She's another one that doesn't have much of a goal. She just wants to live her life to the fullest before her shortened life ends.
Like I said in her backstory, she's from Mondstadt, Land of the free which is ruled by Lord Barbatos or Venti. She also has an electro (electricity) vision that she is extremely talented at using. Her vision allows for her to have a great advantage when battling enemies around water, she also has the advantage of far attacks.
Lisa is a favorite of mine because of how intelligent and humbling she is. Also despite being apart of the Knights of Favonius, she's quite playful.