Underverse

Character
Ink tends to get overly involved in things. He also has a very short memory and forgets things—sometimes stopping mid-sentence to try to remember what he just said a few seconds earlier.[14]
He's very passionate about art and loves to motivate both characters and creators. He can change people's clothes simply by painting them with a brush, and he enjoys creating clothes they like. Despite being an artist, no one has ever seen his paintings.[14]
He is a mischievous fellow. Pranks are his forbidden fruit[14].
Ink generally acts witty and playful.[14]
Because he has little interaction with others, he is harsh in his teasing and ridicule, as well as in his ability to be supportive and kind.[14]
He is extremely forgetful, so he makes notes on his scarf.[14]
Ink approaches his enemies cautiously. He never tries to attack them first, but rather tries to understand their motives and communicate with them. He knows what to analyze to guide people on the right path.[14]
Sometimes he vomits ink randomly, mostly when he is overly emotionally shaken, whether by passion or shock.[14]
Inc supports all forms of art such as painting, literature, dance, music and so on[14].
He is afraid of whiteness, the absence of any forms around him, loneliness, huge empty spaces[14].
Ink doesn't seem like a character with perfect behavior. He can sometimes be inconsiderate in his mockery and cruel in his opinions. He doesn't put others on the same level as himself. He has a very peculiar morality, which sometimes seems truly disconnected from his emotions.[14]

In 2019, an anonymous user sent a request to Comyet, reporting that a Pokémon trainer design released before Ink!Sans's arrival was strikingly similar to Ink's. In response, Comyet explained the situation: she had unknowingly been inspired by the character, believing she had created the design first, thanks to the original creator's approval for its use. She concluded the post by stating that a redesign for Ink would be ready soon.
On January 4, 2020, Comyet, Ink's creator, released a new official design for the character. She asked the community to use the new design, but also allowed them to use the old one if they preferred it.[14]

Brown is the dominant color on the palette because brown is the color most often produced when all colors are mixed together.[14]
Yellow and green are the first colors Ink discovered, and they both have "homages" in their clothing colors.[14]
Ink tucks his jumpsuit in and wears it like pants.[14]
The absence of shoes reflects his carefree and active nature[14].
The light green color on his gloves mimics the tablet glove used by digital artists.[14]
The white T-shirt suggests that Ink is trying to hide his heartlessness, but sometimes his emptiness shines through.

Ink often tries out different colors and makes notes on the scarf due to his poor memory.[14]
His pupils change shape and color every time he blinks. It's suggested that they represent the diversity of universes with their shapes and color combinations, and each time they appear, it means Ink is observing the events of the AU unfolding through his eyes, as if he were constantly watching. Ink claims the shapes and colors are random. However, his pupils are never white.[14]
The rainbow bottles on his belt are paint bottles with heart/human soul shaped caps.[14]
Has a brush which he wears on his back[14].
All his bones under his clothes are painted with strange patterns.