There's dud services side quests (the ones you buy from the dud bears) and plot-related sidequests.
Plot-related sidequests are given by various npcs in mana village. They net you unique weapons/armor, crystals and misc. items. Note that some of these are given by shopkeepers (that's what the 'chat' button in the dialogue window is for).
It isn't necessary to do any of the 'bought' quests in order to complete the game, it isn't even necessary to kill everything in the zones related to the main quests. The game is easy enough without it 8) Some of the plot-related side quests are a big help, though.
Plot-related sidequests are given by various npcs in mana village. They net you unique weapons/armor, crystals and misc. items. Note that some of these are given by shopkeepers (that's what the 'chat' button in the dialogue window is for).
It isn't necessary to do any of the 'bought' quests in order to complete the game, it isn't even necessary to kill everything in the zones related to the main quests. The game is easy enough without it 8) Some of the plot-related side quests are a big help, though.