Her basic setting ... is that she's a junior high student. Since she's a junior high student, her height and chest are within parameters. She's the type that does things at her own pace.
She's a Yamato Nadeshiko that helps out as a miko around the family home. She learned how to write neatly from Nippen. Because she began to solicit Nippen (rather than just promote it), she was soon called "Nippen no Miko-chan" by her friends.
Full Name: Sakamoto Miko (She was renamed since her old name was so terrible. I borrowed her last name from a certain eyepatch wearing character lol)
She's mainly shown as ... a junior high school girl (jumper), or as a miko. Although a different school year than Poniko and friends, she still seems to know them.
Note 1: When I first drew her, I pictured my own recollection of junior high, though it's different from the children seen nowadays.
Note 2: The setting of helping out as a miko around the family home is the same as Lucky Star, but at the time that I thought of this setting, I had not seen Lucky Star so I didn't know.
