Watching the SnapCube fandubs made me wish there could be a Sonic adult cartoon—a SAC, if you will. Basically, everyone would still be in-character, but now they swear and make crude jokes when it fits the situation because most of them are teenagers.
Sonic and Rouge would be the types to swear casually; using curses as adjectives and to exclaim in surprise. They provide most of the sexual humor, which are more on the comedic side than exploitative. They're great at combining curses and normal words to create hilarious insults.
Shadow and Knuckles mainly swear to express irritation or for intimidation. Sonic and Rouge would try to make a sex joke out of the serious things those two say.
Eggman would act like he's above swearing until he's at the end of his rope. Then he's just spewing a constant stream of curses, his voice getting higher after each one.
Tails also doesn't swear unless he's very stressed.
Amy tries to avoid swearing by shouting innocent words, but if she's very mad, she'll snap and spit threats so gruesome, everyone in vicinity are left in stunned silence.
Blaze swears in British slang. A lot of "bollocks", "sods", and "arses".
Silver swears with sincerity. He says bad words when he does feel bad.
For the plot of this cartoon, I'd choose for it to be an adaptation of either Shadow The Hedgehog or the Sonic Riders series. Yes, this is because of the "ow the edge" memes. Plus, the Babylon Rogues seem like the types to swear.
I imagine the SAC to be extremely non-canon, so if the setting is Sonic Riders, then the SEGA cameo characters – NiGHTS, Ulala, Aiai, Amigo, and Billy Hatcher – would be part of the cast. Sonic is way more flirtatious here; he hits on Shadow, Knuckles, Blaze, and NiGHTS. He and Rouge exchange sex jokes, too, but those are clearly just jokes.
Eventually, it's revealed the SAC is a dream, which is why NiGHTS is there, and it's Eggman's dream. Somehow, he's teamed up with Wizeman to steal dream energy from everyone present. He was currently asleep with a special helmet that lets him pull minds from across the multiverse into this dream.
To thwart their respective bad guys, Sonic and NiGHTS dualize. They become SoNiGHTS—a fusion that has the colors of Sonic and the proportions of NiGHTS. Together, they defeat Wizeman, and the dream ends.
Eggman wakes up to the sight of Sonic and his friends standing in front of him, ready to beat him to a pulp. Behind Eggman, Silver and Blaze float down, and then Shadow and Rouge teleport into view. And then they all beat the tar out of him like the Powerpuff Girls in their intro scene.
Oh, and everyone’s voiced by the cast of Real-Time Fandub.
