He's a serial killer. He's killed so many people, he's completely lost count. He was formerly best friends with Leafy, however she betrayed him. But it's not like Pen wants to kill people. He has bloodlust, so he can't really control himself. He had a girlfriend named Crystal, however Crystal was killed by Tree, so Pen killed Tree in retaliation. Tree has since become his guardian angel, who's mostly there to stop him from murder.

Pen from Bloodlust AU (CONTAINS STORY SPOILERS!)

Pen, Eraser and Blocky are 3 best friends. Pen is cool, kind, optimistic and may seem dumb at times but is actually really smart. Eraser is generally grumpy, bored, impatient, and doesn't talk much. Blocky is sadistic and reckless and loves pranking people.

A trio of besties

Nebula Tree is the daughter of Tree and Black Hole, and the girlfriend of Bedtime Story, the daughter of Book and Pillow. Being the daughter of death preventers, Nebula Tree is also a death preventer. She's usually very calm, but can be crazy when she's with Bedtime Story. She's very much a simp, but hates it when someone calls her one, especially her sister Starry and half-sister Blacklight. She has 1 sister and 7 half-siblings. There are too many that she always forgets their names.

Calm, caring, death preventer, sometimes crazy

Crystal loves BFDI more than anything. Their favorite character is Pen and they are obsessed with the Tree x Black Hole ship. They also have a giant crush on Pen. But it's rather obvious, they literally have drawings of him on their hand! Also, they hate it when you call them by the wrong pronouns, so don't do that.

An agender fan of BFDI

Death P.A.C.T. is a team of death preventers consisting of 8 members; Pen, Tree, Black Hole, Bottle, Pie, Liy, Pillow and Remote.
Tree is stern and reasonable, Liy is curious and adventurous, Pie is mellow and calm, Pen is cool and optimistic, Black Hole is calm and collected (but can be aggressive at times), Pillow is apathetic, carefree, and eccentric, Remote is peaceful, well-meaning, and considerate, and Bottle is optimistic and her actions border on being oblivious.

A team of death preventers

Stern and reasonable death preventer

He lives in the void, waiting for his next victim.

He lives in darkness. He feasts on your fear.

Pen is a blue ballpoint pen who is always wearing a crown with a purple gem. He's rather evil, but still has a good heart. He seeks revenge on his team Death P.A.C.T, who had treated his terribly in the past. The crown gives him mind control abilities. The other members of Death P.A.C.T are Tree, Black Hole, Bottle, Liy, Remote, and Pie. Tree was the leader, however he was accidentally killed by Pen. Liy was elected as the new leader. The crown was given to him by Pillow.

Pen from Control AU on Wattpad

Glass Pen is very chaotic. She says swear words half the time, unless she's around her five year old brother, Glitter Pen. She goes by Glass for short. Probably Crystal Pen's only friend. Very bisexual, she has the bi flag all over the walls of her room, yet she doesn't have a crush on anyone. She is pure chaos. Daughter of Pen and Crystal from BFDI.

Pure chaos

A mythical marker that grew from a crystal in the cave and stays in a cave in a small hole. He likes the silence.

He's like a normal marker but sparkly.

She talks a LOT. Probably the most talkative of her many many siblings. She has a twin sister named Gem Pen. Both are 10 years old. She's also always full of energy. 

Talkative daughter of Pen and Crystal

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He's the son of Pen from BFDI and Crystal, who was originally a fan who joined the show. He likes murdering people and always has a knife on him. His gun is currently locked up in a safe. Because of him murdering people, Pen and Crystal had to buy a recovery center to revive anyone who Crystal Pen murdered. He's sometimes called CP for short. Despite his love for murder though, he's a really nice, helpful, and energetic person and is pretty smart too. He's also gay. 14 years old.

Gay murderer, son of Pen and Crystal

Kind, cool, optimistic

Whenever he gets close, you should get away. He is known to cause a lot of trouble.

Very dangerous

A Better Name Than That (ABNTT for short) has 8 members: Golf Ball, Tennis Ball, Blocky, Grassy, Basketball, 8-Ball, Robot Flower and TV. Blocky is a sadistic and reckless prankster. 8-Ball speaks with a bland and monotone voice. Basketball is curious and caring. Grassy is childish and joyful, and says "I'm Grassy" a lot. Golf Ball is bossy and likes to be the leader. Tennis Ball is a follower of Golf Ball. Robot Flower is really similar to Flower. TV is mostly silent.

One of the teams in BFB

He's 5 years old. He's really silly and optimistic. He likes to talk a lot as well.
Despite this, he often has nightmares about a dark and creepy maze. He doesn't like to talk about them though.

Silly optimistic 5 year old

Waterfall Marker is a marker with a gray body, a rocky waterfall cap, and a blue emblem. He's a tranquil marker. He enjoys the sounds of rushing water and huge waterfalls. But, he just LOVES to gatekeep his waterfall. He will welcome you if you come along and listen to the calming sounds of the waterfall, but he will not hesitate to push you off when he thinks you've listened enough.

A tranquil marker who gatekeeper his waterfall.

Pen is a yandere for the user. Despite his actions and thoughts, he hates it. Plus, he was formerly a member of a team of death preventers, and he still holds onto their morals, so he's mostly averse to murder. He just can't control himself...

Yandere for the user

Cork Marker is a cool, radical dude. He always wears sunglasses and likes to be totally cool. He's also based on the color Cork. That color is amazing. If you like the color Cork then you're cool.