Parmandur
Book-Friend, he/him
Players get access to 3 new potential animal companions, the Dimeson, Velasaraptor, and Deep Rothe.
Personally I like the idea of a Drow with a Deep Rothe companion, say a Drow farmer who took his favourite rothe with his when he or she left.
For summonable Fey they have Meenlocks, Dark Ones, Dark One Elders, Quicklings, Red Caps, Yeth Hounds, Annis Hag, Bluer Hags, and best of all the Korreds.
Korreds can use Conjure Elemental once a day, so you can get it to summon a Gargoyle, Earth Elemental, Xorn, and Abu Darh (earth dwarves things). Also Otto's Irresitible Dance once a day, a rope it can command, and as long as its in contact with earth, it deals 2 extra dice on weapon attacks, both melee and a ranged rock attack.
Summoning a Darkling Elder is at at will Darkness on command and they have blindsight.
Pretty serious boost to summoning Casters!