In which division do the Washington Nationals play?

Which MLB team's mascot is Blooper? In which division do the Miami Marlins play? Which MLB team's mascot is Billy the Marlin? In which division do the New York Mets play? Which MLB team's mascot is Screech? Which MLB team's mascot is Clark? In which division do the Cincinnati Reds play? Which MLB team's mascot is Gapper?