>>706025Azumanga if you can count Chiyo as the MC. It does seem more common to have other main characters be the rich ones, like in Gochiusa or Kinmoza.
In general lots of SoL make the characters seem rich as fuck due to how huge their houses are. It's like how much it stands out in Yama no Susume when they actually have one in a realistic size house to show how rich the others are. There's also stuff like Koufuku Graffiti where a middle school girl is living alone in a house bigger than most people could afford.