Sorted by name.
___
Bertram (Brother) - Greic Leaf
Boss (Blacksmith) - Iron Ore
Connelance (Workbench) - Torch
Eagen (Fellow Adventurer) - Rutra Herb
Gunsqueak (Trader) - [Monster] Loot
Horton (Name Items) - Bottle of Water
Jarrell (Salesman) - Rutra Herb, Carrot [It seems he likes everything.]
Keslin (Maid) - Carrot
Liffely (Inn keeper) - Carrot
Linus (son of Tailor/Workbenchmaiden) - Loot, or cookie (probably any dessert).
Millinter (Enchanter) - Lvl.1 Suppression
Meracon (Father) - Lucky Lunch
Sallintz (daughter of Tailor/Workbenchmaiden) - Ruko Fiber
Thorton (Tailor) - Rutra Herb
Qwilte (General goods) - Rutra Herb
Xebec (Mercenary at Inn) - Lucky Lunch
Yeardley (Potions) - Rutra Herb
Zathus (Adventure's Guild) - Lvl.1 Suppression
-----Need items---
Ankaba (mercenary) (Un-giftable?) - [It seems as though she gets +5 every time you hire her, but that there is no other way to increase her affection.]