Boy-Thing

Avengers#12 ()
avengers_012.jpg - 27.4 KB Thor and his dad share a vision that involves some vampire called the Shadow Colonel. If you look closely you can see a green blob on his shoulder...

Spotted by Guillaume

Avengers#14 ()
avengers_014.jpg - 18.9 KB What!?! Is the chaingun wielding Shadow Colnial wearing Manny's head on his shoulder?

Spotted by Guillaume

Avengers#15 ()
avengers_015.jpg - 18.9 KB The Shadow Colonal reveals his shoulder adorment is called Boy-Thing and that the Colonal grew him from a trimming he stole off a swamp monster in the everglades, because If you want to wage a war on vampires, you need a good supply of wooden stakes.
Now this could have some serious story telling implications down the line. Growing plants from cuttings is cloning, so the marvel universe now has two Man-Things with the same powers and abilities. Whether they have the same personalities is a moot point; Ted Sallis' conciousness could be in both but Manny isn't usually much of a thinker so how would one know.

Spotted by Guillaume.

Avengers#16 ()
avengers_016.jpg - 18.9 KB The Shadow Colnial has a plan in Sibera that involes vampires...

Spotted by Guillaume

Avengers#17 ()
avengers_017.jpg - 18.8 KB Blade takes down the Shadow Colonial aka Xarus aka son of Dracula down after finding out he calls his shoulder-pad "Boy-Thing" hahaha. Blade then decides that unlimited supply of wooden stakes might come in handy...

Spotted by Guillaume

Avengers No: 21 ()
avengers_021_blade_boy-thing.jpg - 14.1 KB Boy-Thing is back with Blade, and can sprout swamp wings!?.

Spotted by Adam J. Teterus at the facebooks

Avengers No: 22 ()
avengers_022.jpg - 15.1 KB Blade does exposition and shows off Boy-Thing in every panel.

Spotted by me

Avengers No: 23 ()
avengers_023-7-boy-thing_detail.jpg - 23.7 KB Boy-Thing has a moment and shows his touch can burn...

Avengers No: 24 ()
avengers_023-7-boy-thing_detail.jpg - 31.9 KB Boy-Thing grabs a hold of then losses his grip on one of the various Ghost Riders who seem to be at war with themselves and the Avengers.

Avengers No: 27 ()
avengers_027.jpg - 24.3 KBStarbrand Reborn Part One: Riot in the Space Prison! Boy-Thing hangs around an alien prison the size of a galaxy, where a mysterious new wielder of the all-powerful Starbrand has suddenly appeared, unleashing cosmic chaos.

Spotted by Me

Avengers No: 28 ()
avengers_028.jpg - 22.2 KBStarbrand Reborn Part Two: The Drawing of the Heralds! Boy-Thing rides shot-gun after a mysterious new wielder of the all-powerful, cosmic super-weapon the Starbrand pops up inside a space prison the size of a galaxy.

Spotted by Me

Avengers #29 ()
avengers_029.jpg - 23.6 KBStarbrand Reborn Part Three: The Rise Of The War Widow! As the battle for the Starbrand heats up Boy-thing becomes living wooden armour for Blade...

Spotted by Me

Avengers No: 45 ()
avengers_045.jpg - 22.3 KB Jason Aaron (w), Luca Maresca (a), Cover By Cory Smith
The Avengers join the battle against the King in Black! The vampire hunter Blade (and his shoulder pad accessory Boy-Thing ) have been at the forefront of the fight against the dark symbiote god, but now Blade must pay a dark price that will change his world forever. 32 PGS, Rated T+, $3.99

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Marvel outline of Boy-Things history

During Blade's stint with the Avengers, he bonded with Boy-Thing, a child created from clippings of the Man-Thing. During a battle with the Legion of the Unliving, Blade freed Boy-Thing from the Shadow Colonel, who was secretly Dracula's son Xarus, in Avengers (2018) #17 by Jason Aaron and David Marquez. Like Man-Thing, Boy-Thing burns anyone who feels fear and can drastically reshape his physical form.

With Boy-Thing perched on his shoulder, Blade worked in tandem with the young supernatural powerhouse throughout the rest of their time together on the team. In fact, shortly after bonding with Blade, Boy-Thing produced a set of wooden blades for the Daywalker, which he used to behead Xarus. He also briefly gave Blade a set of wings.

They grew closer than ever when Blade was weakened by red sunlight in Avengers (2018) #29 by Aaron, Paco Medina, and Ed McGuinness. To help the ailing Blade, Boy-Thing transformed into armor that completely covered him to protect him from the alien world. With Boy-Thing's power working in conjunction with his abilities, the armored Blade was able to fend off the Silver Surfer and draw blood from the Gladiator, a powerful Shi'ar warrior. When Blade's time with the Avengers ended, Boy-Thing returned to Man-Thing's custody.