This is just my version what I think he looks like 13 years later.
Here's my fan made backstory I did for him a while back.
Butters was a warmhearted and naive boy in South Park elementary. He was also considered the most gullible and easily picked on at school. However, he was able to make some friends, surprisingly, with Eric Cartman, Stan, Kyle, Kenny, and Pip. Out of his friends, Kenny and Pip were Butter’s best friends because they both have a sense of dignity. Aside from school life, he has problematic family situations; both of his parents were one of the most conservative and strict out of any average parent in South Park. Sometimes he gets grounded from the things that were beyond his control. His parents could be abusive for the wrong reasons even though they thought it was part of a good parenting tactic. Throughout his childhood, Butters had suffered mental trauma and sometimes health problems. As growing up, Butters was able to stand up with his parents’ abusive settings and go about his own ways. Through his ‘tween" years, Butters began rebelling against his parents. By all means, his parents couldn’t ground him anymore. It have gotten to a point when he became immune to his parent's punishment also being desensitized with physical punishments. Furthermore, Butters seems to care less about what his parents think.
At the age of 15, he had a sexual attraction with both boys and girls including Kenny, Wendy, Red, Dougie, and Kyle. He wasn't able to concentrate on his school work for three weeks. Later, he went to a psychologist and confirmed his sexual orientation as bisexual. During Sophomore Homecoming week, Butters asked Wendy out but unfortunately was taken by Stan. Furthermore, he went asking some girls out but Wendy was his one and only interest. He went on a limb and asked Kenny. Although Kenny couldn’t go because his mom couldn’t afford anything, Butters opened up to help take care of any payments because first of all, he was his best friend and secondly, he wanted him to forget the familial troubles and have a bit of fun. Kenny accepts and went as friends to Homecoming. After Homecoming, Butters wanted to talk to Kenny in private about his sexual appeal. He admitted that he fell in love with Kenny before Homecoming. Kenny got a bit confused of what he wanted. Butters tried to not to embarrass himself by attempting to explain to him his intimate thoughts. In addition, he wanted to be more than just “best” friends. After long confusing hours, Kenny had a hard time understanding on what Butters was trying to say. Butters just straight up went for the kiss on the lips. Butters then apologized for the weirdness worrying that Kenny would have flipped out or get into a fight. Fortunately, Kenny remained calm and composed and understood Butter’s intentions. Butters later asked Kenny if he could be in a "low-key" relationship however, Kenny wasn’t too sure about it because of his sexual orientation. He wasn’t really into Butters in which made the situation a lot more awkward than what it seemed. To make it up to him, Kenny decided not to be in a relationship with him and rather just hang around with him. During Christmas break, Kenny hung around in Butters’ house for the weekend to celebrate the holidays. Throughout all the time they hung out, Kenny starts to feel an emotional connection with Butters. He wanted Butters to be his secret boyfriend as Butters’ Christmas gift. Butters felt ecstatic and accepted the offer. Their relationship lasted until the second semester of junior year high school and ended up as just friends more but slightly distant from each other.
During in college, Butters began to grow as an individual person and set his own ambition. He majored in painting and double minored in dancing and photography. He made at lot of new friends throughout the years and was part of the top ten most popular students in college. Alongside, he became insusceptible to Cartman and Kenny’s insolent and manipulative behavior. He spends most of his time alone working on his paintings plus taking expressionistic photographs. Usually most of his photographs include Pip, Wendy, Tweek, and sometimes himself. Surprisingly, he was able to at least collaborate with more than 20 people for his projects. Each and every year, he grew more successful.
So yeah, also the reason why I gave Butters a sleeve tattoo is because within a couple years of his life, he would soon rebel against his parents. In addition, he is also more in the lines of artistry therefore treating his body as a blank canvas.
I can see him more of a hipster more likely inspired by Adam Levine, Macklemore, and Tyler Oakley.
Butters © Matt and Trey
Art © me