Because fiddling with alternate universe settings is pretty fun. A drawing featuring Femboy Ben, Charm-Ben, and an assortment of others.

Femboy Ben: Due to glitches suffered during the confrontation with Malware, the Omnitrix has managed to completely alter and shift Ben’s internal chemical and hormonal make-up, resulting in him slowly becoming more and more feminine. He would also unlock access to a variety of new forms that were on the very cute and feminine side, as well as others that should have only been female only. Even several of his original forms would end up a bit more feminine in appearance.

Charm-Ben: Charmcaster succeeded in body-swapping with Ben. However, in the immediate scuffle, the Omnitrix’s AI seemed to go haywire, as if sensing something that it seemed WRONG. It then jumped from Charmcaster in Ben’s body to Ben in Charmcaster’s body. The magical energy that the device would absorb and bond with alongside the DNA would result in it shifting appearances to better acclimate. Both Charmcaster and Ben were stuck in their new bodies, due to a combination of Ben’s lack of magical understanding, and a strange shortage of sea urchin eggs because of both a sudden high demand AND the supply chain unable to keep up due to terrible conditions.

Goth-Loli Ben: This Ben’s life followed exactly as Femboy Ben’s did. However, the confrontation with Malware led to an accident that caused his Grandpa Max to end up in a coma, who would later pass away. A devastated Ben would eventually utilize his more intelligent aliens to create an improved Omnitrix, and began delving in traveling through alternate timelines and dimensions, where he would, out of some degree of jealousy and coping, begin to tease and mess around with his various alternate selves. He also always looked forward to seeing the Max of those various timelines. Perhaps, for this Ben, he was incapable of accepting the reality of his own scenario.

Gwen 10 and Anodite Ben: As with any Gwen 10 setting, the Gwen in this dimension was the one to gain the Omnitrix, resulting in a rather jealous Ben. During the initial confrontation with Hex, instead of the charm of luck, Ben would instead end up with the charm of telekinesis. Likewise, where as Gwen would have gone on to destroy all the charms, Ben would instead opt to keep them. Unbeknownst to the group, as Ben wore the charms, his body would absorb the magical energies from them. Once Vilgax attacked, in an effort to call upon the magical powers to help and save Gwen, Ben would accidentally ‘overload’ himself and unlock his Anodite heritage. However, due to inexperience, Ben would have trouble changing back into human form. Sometimes he would change back and be a boy, and other times he would end up a girl. Despite that, both he and Gwen would become a very capable duo.

Anodites of this universe are not from an alien planet, but are beings of pure magic hailing from a dimension of magic.

Brenda AKA Oujo-Ben: A female alternate version of Ben hailing from a timeline where the Earth has long since formed connections with the rest of the galaxy, and so seeing aliens was commonplace on the planet. The Tennyson family of this setting amassed a great deal of wealth due to a long history of delving into intergalactic trade and technological advancement, as well as a variety of other fields, such as Brenda’s own father being the creator of Sumo Slammers. Brenda can be rather haughty and high maintenance, but still possesses the desire to help others. Brenda would one day obtain the Omnitrix as she was being held captive for ransom, and the pod burst through the ceiling into her holding room.

Brynlee AKA Science-Ben: Another female alternate version of Ben. This one grew up in a world largely similar to Prime Ben. Brynlee, however, would have an intense interest in science and learning. The unknown fascinated her, and was always seeking to understand more and could absorb knowledge rather quickly. While looking through the closet cupboard on the Rust Bucket one day, Brynlee would find a secret compartment housing a strange ring-like device. It would end up bonding with her, and she would learn from her Grandpa Max that it was something he recently found, but kept in a safe spot until he found the time to figure out more about it.