Future Trunks appears in the fourth arc of Dragon Ball Z to change the course of an apocalyptic story that awaited Goku and his friends. The young warrior arrives to warn of the arrival of a pair of androids that will end the peace of Earth.
His arrival, in a time machine made by Bulma, causes several timelines to be created, and some of the ones he spawned we may not yet know about.
In some of them, we imagine that there must be some Trunks who has achieved the transformation of Super Saiyan 4. Or at least that was what the Chilean designer Crist Art, with a brutal illustration showing Vegeta’s son in this mode.
The long purple hair is combined with the fur of the same hue, the intense look and the red color in his eyes, to show for the first time (without being part of the canon or official products) the Trunks Super Saiyan 4.
The Super Saiyan 4 transformation is a Super Saiyan form exclusive to the Dragon Ball GT series. He appears as a combination of the Ozaru (Great Ape) transformation and the Super Saiyan form.
Unlike other transformations, which are activated with the control of Ki, this transformation is achieved through exposure to full moonlight and subsequent transformation into a controlled golden Ozaru, and then transforming into a Super Saiyan within that shape.
Once the Super Saiyan 4 form is reached, the user gains a great deal of power and enhanced abilities. Notable traits of this form include red fur all over the body, with the exception of the upper torso, shoulders, and face, which remain hairless.
The user’s skin also turns redder, and their hair becomes shorter and darker. Additionally, the user’s eyes turn yellow and her pupils become larger.