Parakeetman
No one wants a throne you've been sitting on!
help him if you wander into him on the field otherwise ignore his request
there is no reward, no achievement and no unlockable for doing those requests
yes a yellow speech bubble as opposed to the normal white ones are dating/lover speech bubbles. Those will fill up the enjoyment meter really fast.
best place to get those is outside Agil's place by the fountain up til relationship level 3 and after that in kirito's room on the sofa or on the bed to get to level 5
actually helping the npcs is how you become friends with them so that you are able to use them as a selectable partner or during the offline mp mode