Don't believe everything you find on wiki.
Depanding on charisma you can lead/catch:
3 CH = 1 NPC
5 CH = 2 NPC
7 CH = 3 NPC
9 CH = 4 NPC
Magnetic personality +1 --> max 5 slaves.
Be advised, with 5 slaves following you encouters will be much bigger, making it much easier to die / loose slaves unfortunatelly.