Miku
vocaloid
A lot.What quests have NPCs helping you? The only one I know is Ep4 Warrior's Pride, are there more?
Unsealed Door
Seat of the Heart (although you could argue the NPC is hurting you)
The Retired Hunter
Battle Training
The one with the description of Rescue Ult.
The Elenor-related ones, including the story one in the starting 3 of side story ep1 about mags.
A New Hope
A bunch more of the side story in ep1 quests, but I don't remember them all off the top of my head.