Ben 10 - Gwen 10 (Classic)

In every Bens in different realities, timeline, and space itself throughout the multi-verse (parallel worlds). That also "Cross-time", which is made up of every parallel versions of the history we now know or lived in. There's hundred of them, like a world where Gwen found the omnitrix. An alternate reality, the same day that Ben first found the omnitrix, but Gwen found it instead. Gwen quickly adjusts to the omnitrix's power with much greater ease than Ben ever did. Gwen uses the omnitrix much more than required hence when it actual needs for the omnitrix; according to the Ben 10 (classic) episodes: "Gwen 10" and Ben 10: Omniverse series: "And then there were none/And then there were 10." These are all the aliens that Gwen ever transformed or mention throughout the series of Ben 10.