The first model was created to clean the Lair for the Turtles so they could go see a Lou Jitsu movie. Initially, Leonardo, Michelangelo, and Raphael were in favor of S.H.E.L.L.D.O.N., until they discovered that he was programmed to favor Donnie over them. Because of this, the three turtles rewired S.H.E.L.L.D.O.N. to favor them over Donatello, but he malfunctioned to the point of trying to kill Donnie and replace him as the fourth brother.
Although the first model is ultimately destroyed by Raphael, Donnie eventually creates a new model, who does not seem to favor any one family member over another.
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S.H.E.L.L.D.O.N. initially resembled a metallic grey floating head with large glowing orange eyes and a small yellow grin. He also has rectangular pupils, much like a goat. He has been described as a "hawk bird drone", suggesting an avian-like appearance (though according to Donnie he is neither a bird nor a hawk drone, so this resemblance is not intentional).
When Raph, Leo, and Mikey reprogrammed S.H.E.L.L.D.O.N. he had sported a torn-up purple bandanna.
With his current model, he resembles a purple sea turtle but with drone propellers at the end of his flippers. His eyes are still orange but he now has glowing purple accents in the forms of circles on his propellers and as a thin line on his face for a mouth. His mouth glows brighter when he is talking.
S.H.E.L.L.D.O.N. when combined with Donnie's battle shell appears as a stocky bipedal turtle robot, the shell and his head being the only identical features to his prior form. His glowing purple accents are now located on a dark purple plastron as three lines parallel to each other on his stomach. In this form he additionally has three-fingered hands and two-toed feet.
S.H.E.L.L.D.O.N. was at first very well-mannered and attentive, much like a butler. Even though he was programmed to prioritize Donnie's needs, he still took the time to serve Raph, Leo, Mikey, and Splinter.
But when the other turtles reprogrammed S.H.E.L.L.D.O.N,. he adopted a "party dude" attitude, and began to act much more disrespectful to Splinter and especially Donnie, so much so to the point he attempts to kill him in order to replace him as the turtles' brother. He had been rebuilt to not favor any turtle, but his laid-back but helpful behavior remains a part of him throughout the rest of the show.
Upon his version 13 update to his operating system, he behaves much like a defiant teenager, rebellious and sarcastic. He also has a interest in drone racing, so much so that he got grounded by Donatello for racing in the lair.
- Technology manipulation: S.H.E.L.L.D.O.N. has wireless control over Donnie's other inventions such as his battle shells, laser vacuums, and hovering microwave.
- Multiple limbs: S.H.E.L.L.D.O.N. has many retractable arms. Some have grabbers, much like Donnie's spider-shell arms, while others have pointers, sharp daggers, flamethrowers, projectile weapons, drills, sharp spikes, and other various types of weapons and tools.
- Flight: As a drone, he is designed to be able to hover and move around in the air. In his revamped form he is able to fly at high speeds.
- Hacking: S.H.E.L.L.D.O.N. is able to hack into machines, such as ATMs, by connecting USB cords from his own body into other computers.
- Donatello: Donnie initially created S.H.E.L.L.D.O.N. to do chores for him and his brothers. However, as time went by, Donnie appeared to grow more attached to S.H.E.L.L.D.O.N., forming a father/son like relationship.
- Hamato Karai: S.H.E.L.L.D.O.N. died trying to protect Karai from the Shredder.
- Leonardo: Leo much like his fellow brothers was peeved about S.H.E.L.L.D.O.N. being programmed to favor Donatello over their comfort, and was the one to suggest and lead his brothers into reprogramming him. After his second incarnation, Leo trusts him much more, even assigning S.H.E.L.L.D.O.N. to protect Karai when Shredder attacked.
- Greg Cipes, S.H.E.L.L.D.O.N.'s voice actor, also voiced Michelangelo in the 2012 TV series.
- As a nod to this, S.H.E.L.L.D.O.N. sometimes says "Booyakasha!"
- According to Donatello in "Cloak and Swaggart", S.H.E.L.L.D.O.N. has nine ears, all located in various areas of his design, and likes it when people "scritch behind" said ears.
- Donnie also stated that S.H.E.L.L.D.O.N. also requires a change of coolant three times a day.
- S.H.E.L.L.D.O.N.'s first animated appearance actually predated his own in the show, albeit as a CGI model in a 360° promotional video on the Nickelodeon YouTube channel. In this video he went on a "milk rampage" when his "milk feed protocol" was set off by one of the turtles drinking all of the milk and putting the empty carton back in the fridge, upsetting Donnie greatly.