Full Name: (Pretty much the real name section you've already got listed. Sometimes I list this as real name instead of full name, but having it as full name encourages people to include the surname and even the middle names if they exist.)
Also Known As: (This is for titles, aliases, nicknames, et cetera.)
Birthdate: (Depending on how and when the role-play it set, I consider this more important than simply listing age. Basically, so long as you have a date set for your role-play - which I always do - it's easier to make an assessment of someone's age based on the date instead of having age listed, especially since ages can change depending on how long the role-play goes for.)
Place of Origin: (This is - if I'm not mistaken - what you listed as the character's nationality.)
Ethnicity: (Where we're born and our ethnicity can be different. For example, I'm Australian but my ethnicity is - more or less - Greek-Scottish. I say 'more or less' due to there being a vague possibility I've got Turkish blood in me as well, but for all intents and purposes the only people who could confirm this are dead.)
Gender: (You have this listed as the character's sex. I prefer gender, simply because it prevents people from putting 'yes please' as a smartass answer, but then no one's going to do that seriously anyway. Also, sometimes I include sexual orientation in a character sheet, so having gender instead makes the categories more diverse.)
Age: (You've got this.)
Height: (I consider this category pretty essential, especially since those who just give a picture might not mention it.)
Weight: (Less important than height, especially in a setting where people have superhuman strength, but still useful to have. Female characters more frequently have this listed as unknown than male characters, but can still be a useful category in a few regards.)
Laterality: (Right-handed, left-handed, or ambidextrous. Can be useful.)
Blood Type: (This is only useful in certain circumstances, but it can sometimes be good to have for those situations.)
Occupation: (Presumably all your characters are music idols, so this would be more for secondary jobs if they have one.)