Radiosity
Writiosity
And Danse apparently gets a synthrection simply from you entering or exiting power armour. Not exactly deep characterisation there, heh.Eh, New Vegas did it better. You had a bunch of scripted events that'd raise affinity with companions, your companions would react realistically to these events and you'd begin a conversation concerning them. In Fallout 4 it's just "Oh boy I love how you pick that lock! Wanna bang?"