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While c00lkidd's Milestone Skin are probably his canon fate under The Specter's Grasp, Cupcake and Nightmare are valid alternatives to his fate. Cupcake is the result of 007n7 getting through to c00lkidd, which leads to c00lkidd trying to rebel and break free, destroying his c00lgui and driving him mad. He now collects parts of the survivors he kills as he thinks he might be able to use them to create an escape, but all its doing is driving him further into madness. Nightmare is the result of a cult getting their hands on c00lkidd instead of 007n7. He was raised as their God and taught how to kill, where instead of going on an arson spree around Elliot's workplace, he murder hundreds of people and eventually got sent to the Banlands, since 007n7 wasn't there to vouch for him and take the heat over the "outdated and badly malfunctioning" c00lgui. In the Banlands, he meet several hackers who he killed and stole power from, before being taken by the Specter. He actively tries to steal power from 1x1x1x1 and John Doe unless The Specter keeps them apart. Of the 3, Nightmare is easily the strongest and evilest, Milestones and the other skins are in the middle, and Cupcakes are the weakest, since coolgui is broken and coolkidd is insane.
Milestone c00lkidd is c00lkidd slowly becoming one with c00lgui, due to The Specter's tampering with both 007n7's and c00lkidd's version. The general safeguards 007n7 installed were broken and eventually c00lkidd and c00lgui might even grow stronger then The Spectre. c00lkidd is literally becoming one with the code, which is almost what happened with Noli before he blew up and became the monster he is now. 007n7 is actively trying to fix the spaghetti code of coolgui to escape the realm, but his teen-self was a little shit and so the code is needlessly complex and has a lot of errors, dumb workarounds and just bad practices that 007n7 is trying to fix.
007n7 was always the best hacker of his era, and probably the best hacker ever. 007n7 actually put limiters on his c00lgui, because after he saw what happened to Noli, he never wanted to go as deep ever again. Outside of the admins, only 007n7 has seen the source code of Roblox and touched it with their bare hands. The reason 007n7 ended up in Forsaken is he has a tracker in c00lgui that he uses to find c00lkidd and get close to him when he's using c00lgui, and when he activated it when c00lkidd went missing, it dragged him into the realm. If c00lkidd were to get free, 007n7 would be dragged out of the realm as well.