Mr. Maw

Mr. Maw walks towards Isaac and when in range it will launch its head towards him. It appears to be a Maw attached to a Gusher and will turn into either upon death depending on the killed body segment. It can also randomly separate at will into a Gusher and a Maw.

Variations

Mr. Red Maw

Mr. Red Maw behaves similarly to Mr. Maw, but moves quicker and has a Red Maw as its head instead of a regular Maw. If the Red Maw segment is killed first, it will release four shots in the cardinal directions like a regular Red Maw. It can also occasionally separate at will.

Mr. Mine

Mr. Mines are chained to pits and will attempt to launch themselves at Isaac if he comes near. They will occasionally burrow and pop up in another pit, often near Isaac. Upon death, they fire six shots in all directions.

Since pits have a chance to replace rocks in the Flooded Caves where Mr. Mine resides, this can give them more tiles to utilize.

Swinger

Swingers behave differently to its variants as rather than firing its head, the Swinger's head is constantly detached and spins around its base clockwise in a fixed radius, while slowly sliding towards Isaac. The cord connecting the head and body of a Swinger isn't solid and does not deal damage. If the base is killed, the spinning head turns into a Maw, and if the head is killed, the base turns into a Globin in its goo form which then can reform into a Globin.

When entering a room, their heads will be retracted and slowly rotate outwards until they reach max length. Since Booster Pack #5, Swingers extend their heads at a much slower pace, making it easier to avoid damage.

Gallery

Sketches of monsters for the Binding of Isaac: Rebirth, including the Swinger in the third square of the third row, formerly known as "Chain Dudes". Interestingly enough, the Swinger in this concept design is a Maw attached to a Pacer instead of a Globin in its goo form.
Concept art for Mr. Mine by LeatherIceCream.

Trivia

Mr. Mine and Mr. Red Maw were added in Booster Pack #5.
Though the Maw appears to have eyes when attached to the Globin, if the Maw survives and spawns upon the Swinger's death, then it will have empty eye sockets.
Mr. Maw makes Gaper noises while chasing Isaac, while Mr. Red Maw makes the Maw noise only if the Red Maw segment dies first.
Mr. Mine is based on the enemy Crunch from The End is Nigh.

Bugs

Bug!	Using the D10 on any monster with several pieces will reroll every piece into a monster. For the case of Mr. Maw, his cord dots are considered as pieces, and each will turning into a new monster.