Josephine

Summary
Josephine (also known as Goth Joanne or Gothjo) is an alt of Joanne who was created as a result of Joanne's Tiger-Brew addiction following her Thickness Sickness. In essence, Joanne had become a different person as a result of her Tiger-Brew abuse, and thus by the laws of the Jonaverse, the metaphorical "different person" became literal.

History
After Joanne and Josephine became different people, Joanne kept her job with the Proton Splat League, which left Josephine unemployed. Tiger-Brows quickly picked her up to be Tiger-Brew's Brand Representative, and now her main line of work is modeling for Tiger-Brew advertisements while showing off their effects.

Josephine's treatment as the "clone" or "alt" of Joanne seems to have had a marked effect on her, and she openly resents her treatment as some sort of offshoot of the original- She has all the same memories, and she's the original, as far as she's concerned. As such, she insists on referring to herself and Joanne as twins rather than anything else.

Personality
Josephine has a lot of the same personality traits as her other half - She's very confident, competitive, and opinionated. However, Josephine is also markedly more self-centered and cynical than her other half as a result of being treated as the "alternate" Joanne, and deliberately distances herself from her twin.

Josephine is very proud of her appearance (perhaps to the point of vanity) and goes out of her way to look for attention, compliments, and jealous remarks. Josephine has an interest in engineering and moonlights with weapon-modification.

Perhaps because her origin involved Tiger-Brew Dark, Josephine is also much more morbid than Joanne and has taken an interest in horror-genre media and philosophy.

Biology
Notably, Josephine is an inkling who has consumed enough Tiger-Brew for the effects to become permanent. As a result, she's over twice the normal height of an Inkling and has enhanced physical strength, toughness, and... ink capacity. Being infused with Tiger-Brew has also made maintaining her appearance effortless (the eyeshadow is literally just a part of her now).

Besides that, Josephine still possesses all of the normal abilities and weaknesses of regular Inklings. It's unclear exactly what else being infused with Tiger-Brew has changed about her, but she's demonstrated at least once that she's capable of 'stealing' size-increasing effects from those around her.