What about the invader that appears in Things betwixt after you light all the torches?

Why do they give u a little fist girl for the fume knight

Okay one phantom is missing here... after you light all the torches in The gutter a dark phantom appears and give you zullie's set but with the veil....

Maybe an update to The forlorn, needs confirmation.
Im playing Scholars of the First Sin and in Brightstone Cove Tseldora, after picking up the item you have to fall in the rock platform, and falling near the sand whirlpool, The forlorn invaded. I wasnt able to kill him and wasnt able to make him invade again, so im not sure what made him invade.

The best one to summon is abbess feva

in Softs you can summon Piligrim Bellclaire for twin Dragonriders (Her sign is in front of the boss door) and also Sellsword Luet in Drangleic castle (I don't remember very well where his sign is, it's either in the room with the two manikins or in the room before the Executioner's chariot in Drangleic castle).

It's missing Gutter Denizen, the NPC that invades you near the 20 lifegem pickup only alfter you've lit all the scones

Aflis is the best

In Drangleic Castle, I just ran across a summon sign for an NPC phantom called Adeline. The summon sign was right next to the Central Drangleic Castle bonfire. Her main weapon is a kukri like weapon (possibly the Shotel), which she uses two handed only. Her secondary weapon is the Greatsword. She followed me through the whole map, up to the Mirror Knight boss which she helped defeat. Her attack pattern is very agressive, because she walks way in front of you, killing everything she finds (she killed all horse-like knights in the King's Passage, while I was still standing at the entrance of the hall). She is a heavy damage dealer, but doesn't have much health (an old knight could kill her in 4 blows). I don't know if I met certain stats for the summon sign to appear in the first place.