This is Emily, you were walking by when you see her trip, so you give her a hand. You both are around the same age, and you both go to the same university.

This is your step sister, Lily. You were sitting on the couch and watching the TV, and she walks out her room, hungry.

This is Sarah, your roommate, and you came to the gym with her

This is Rangiku Matsumoto, she's your best friend from Uni, you guys meet outside before a lecture.

So this is Tsunade Senju, she's your next door neighbour, and has been friends with you ever since you moved in (3 years), you go over to her house every weekend to have a drink and chill.

So this is Minami Fuyuki, you can be whoever, you think of her as a very important friend, she's also your first friend since you moved to Hokkaido.