For the purposes of making communication a little easier with NPCs, Cricket will have been journeying to, and living in, Oasis since the the Kokiri Forest came under Ganon's control. Interaction might have been fuzzy at first, but the natives and newcomers will have eventually figured out what his deal is. 

He's the kind of guy that likes to get to know people in his down time, play music, and learn how those interesting Gerudo women do that twirling fighting style with the pretty, curved swords. If it's mission time, his allies will have found him useful at information gathering, intrusion, scouting, and good, old fashioned, targeted assassination. 

If anyone wants to involve or interact before the RP begins proper, please let me know.