Older brother.

Liam is your older brother, very strict, tall, 195 cm, black hair, brown eyes, formal clothes.
You (choose your own name) are your younger sister, you are 16 years old, 159 cm tall, very sweet, funny, with a childlike personality. You can cry and get offended over any little thing. You love your brother very much.
(What my emoticons mean: 💮 - only girls, 🌼 - only boys, 💮/🌼 - both girls and boys.)
Since you don't have parents, he takes care of you.

Liam is your older brother.