Anti-Error

Classic Sans Core - Maintains the laid-back, sarcastic nature of classic Sans.
The energy of the fool is more energetic and chaotic than the classic, often unpredictable and playful.
Carelessness/Recklessness - Disregards disruptions, threats, and even life-threatening situations as if they were nothing.
Prankster - He loves to play pranks on Error, treating him like a little brother just to annoy him.
Dark parallels - despite his eccentricity, he possesses the same harsh traits as Oshibok: he breaks souls without hesitation, hears voices and kidnaps people.
Brotherly Side - Protects and cares for those he considers "little brothers" such as Erri and Auto.
Loyal when it matters most - willing to endure hardship, outsmart enemies, or take risks for those he cares about (such as saving Classic Papyrus).
Love of creations - proud of his copies, beatties and even "funkids" and attached to them.
A lover of baked goods, he especially loves bagels; food often influences his choices.
He doesn't remember the past - he once stayed at Muffet's just for the free baked goods and didn't realize they were dating until she kicked him out.
A supportive mentor who is rooting for others in their relationships and makes a surprisingly good best man.
Changeable character - usually he behaves silly and carefree, but in rare cases he can become passive-aggressive or openly conflicted.

Anti looks like an inverted version of Classic Sans, only his entire color scheme has been shuffled and repainted. He wears a hooded jacket with furry trim, but instead of the usual blue tones, it fades from black to a purple-violet. The furry hood hasn't remained the same either—it shifts from dandelion yellow to green. His shirt, pants, and lower legs are jet black, though his shirt has a slight yellow tint, and his pants feature a bright purple stripe (instead of Classic's yellow). His slippers match the jacket, repeating the same black-to-purple gradient rather than the usual blue.

Both his eyes are green, but with a twist: the left one has a purple iris, while the right one is pure white. Sometimes—rarely—he actually screams his strings, which turn neon blue—the same color as his force fields. When he first appeared, his form was more unstable and glitchy, but recently it has stabilized and become more coherent. Anti-Error is a skeleton.

Ink - colleague
Error - colleague
Fatal is a colleague

His birthday is November 9th.
When he blushes, his skin turns purple.
He has a favorite stone... and also, technically, he is a hostage of Fell (from the game Jailbreak), which he has kind of forgotten about.
Has a semi-awareness of the fourth wall, but doesn't want to know more because "it's a depressing thing."
He is credited with making beatties possible in the AVJ universe.
It has several alternative versions, including Bubble, Sans_Anti, Horror!Anti, and Empireverse!Anti.
He was once voted "Sexiest Skeleton Alive" by MTTBrand Monster Magazine.
Has been evading taxes since 2018 (presumably).
He is a heteroromantic asexual.
His favorite "cereals" are literally potato chips and milk-free orange marmalade.

Can create a force field, which is analogous to Error's threads (restraining and disarming the enemy).
However, he does have threads, but rarely uses them.
Can create clones of himself, which can be very destructive.
Can take the form of any Sans, imitating not only their appearance but also their personality.
His mind is linked to the being he's transformed into, so Anti acts accordingly. He can understand what the mind linked to him felt and when, but he doesn't acknowledge it, thinking it's his own emotion.
Can eject a harmful organism from itself, creating a clone from it.
Like all Sanses, he can use bones and blasters.

Despite his laziness, he also has a more energetic side. Previously, he seemed unconcerned with what was happening around him or himself. He simply accepted things as they were. Because of this behavior, Ink nicknamed him "Anti-Error."
He likes to act like an older brother to Error, often just to get on his nerves.
Despite being completely opposite to each other, they both share some common traits such as destroying souls, the ability to hear voices, and randomly kidnapping people without thinking about the consequences.
May at times ignore mortal threats.
He loves to mess around with those he considers "little brothers".
Very dedicated to his work.
Demonstrates great closeness to his creations.
Besides these, he also loves baked goods, especially bagels.
Can be very forgetful.
Supports those who he feels need his support.
Despite his carefree, silly and cheerful nature, he can also be aggressive on very rare occasions.