Donatello (future) (Archie)

"Donatello" from alternate future, he gained incredible wealth selling his inventions. He is depicted as a pure-hearted soul, being able to pass through the Netherworld unscathed. Don was also chosen by a group of alien scientists known as the Sons of Silence to share their wisdom to him.

Background
In the future Donatello had gained incredible wealth selling his inventions to benefit mankind, one the actions of his inventions according to Armaggon had wiped out the rat problem and population. He also had a kind assistant and protégé in the form of Manx a mutant anthropromorphic cat had altered his body with Cybernetic implants that drove him insane and became the villain Verminator-X. Donatello had also created both battle suits for himself and his brothers. Along with a time machine called the "Time Slip Generator"

Future Shark Trilogy
When Armaggon (Archie) evil mutant shark from traveled to past where he teamed up with both Shredder (Archie) and his former student Verminator-X. Using his time machine he and Raphael (Future) (Archie) traveled the past to warn their past selves and also seek asstitance in saving future Leo and Michaelangelo. had been captured by Shredder, Verminator-X, and Armaggon. The TMNT chose to help their future doppelgangers and went to the future where they were shocked to learn not only did they live in the public, but were incredibly wealthy as well thanks to Donatello's numerous inventions, mostly his re-design of Baxter Stockman's Mouser robot. The six turtles and Ninjara fought the trio of villains and their unexpected ally the Rat King and freed the future versions of Leo and Mike, along with Merdude who had been captured by Armaggon unbeknown to any involved.

Future Donatello and Raphael were later seen helping the Mutanimals build their new base of operations, but between returning to the future and coming back to the past, the Mutanimals were killed by the Gang of Four. Slash arriving on the Mutanimals island after hearing the gunfire assumed that the Future TMNT were the killers and a battle ensued between the three turtles. After the FTMNT cleared things up with Slash, the three sought the help of the TMNT, and confronted Null, Maligna and their thugs. In the aftermath Slash lost his life, an event Future Donatello said never should have happened, and that in their time line Slash and the Mutanimals were still alive. It was then that the Future Donatello realized that the Time Slip Generator had not taken him back to his past, but the past of a completely different reality, one he had no business interfering in.