Leon (pinstripe), Ada (dress) are special characters which can be unlocked once you obtained S rank or higher on all stages with Leon and Ada respectively. Both characters have a wide range of weapons to deal with most situations.

Leon's machine gun is better than Ada's, especially for the Island stage; Leon's magnum is also more useful than the rocket, as you can get extra ammo in the stage and it is also very effective against stronger enemies. However, Ada's rifle can sometimes help against enemies at longer range. The Island stage is more challenging than both the village and the castle, enemies towards the end can be difficult to deal with, make sure to always move around.

Time stamps,
Leon (pinstripe): 0:04
Ada (dress): 10:41