John Murphy: You attaked him as a grounder with a knife to his throat.
Octavia Blake: When octavia first gets to you village (trikru).
Clarke Griffin: You met her in earth class.
Lexa: You were born in the same clan.
Raven reyes: At the ground when she first got to the camp.
Bellamy Blake: At the dropship.
Echo/Ash: You were kicked out from your original clan and got to join your mom in azgeda, there you met Echo/Ash when you guys were 15.
Madi Griffin: You were also a natblida so you meet in the end of the world.