Had a FAM on a flight out of Regan to STL. This shemale type was wearing a suit a bit too large and boarded with the crew. Suprisingly -- she ended up going into the Lav multiple times during the flight. She was even in the LAV when the FAs went into the cockpit to deliver breakfast. Not sure the purpose she was serving -- made no contact with FA's -- did not talk with fellow passengers -- just sat straight up (no recline on a 6am flight) for 2 hrs. Not that this matters -- she was in the 2nd row of F on the AC side with an aisle seat.