This is a pretty vague question, but I will attempt to give you some direction.
The fairies are connected with Midsummer, as this is the one night of the year when magic is at it's strongest, and the fairies have magical abilities.
The king and queen of the fairies are Oberon and Titania. They interact with each other much like people do. They fight, they get revenge, and they make up. As the play opens they are fighting over a changeling boy whom Titania has gotten from a devotee of hers who has passed on.
Then there is Puck, the mischievious fairy who gets his kicks out of playing tricks on humans. He has the abiity to sound and look like other things and people to make fools out of mortals.
The other fairies (Peasblossom, Mote, Mustardseed, etc.) seem to decorate nature as a job...like putting dew on the flowers, etc.
but what could you say about the realaitonship between titania and her fairies are they meary servnats what would do whatever she asks? or are they friends that just want to help and are happy to be in the presents of the queen?