His name is Jare Bear (but also goes by Jay or Jar)
He's a distant relative of Fluttershy and has been asked to aid Applejack and Big Macintosh in renovating a part of their farm after an unexpected rain storm.
His cutie mark is a smiley face symbolizing his ability to see good in everything. His personality is quiet until he feels he needs to put up to the task, in which he can be either the friendliest or serious pony around.