What type of AUs have you always wanted to see from the Ben 10 franchise ?
There's the Carnitrix which is the evil Omnitrix made by an evil version of Azmuth, the Chaquetrix which summons female aliens (pretty mixed on that idea) and etc but what about your ideas ?
Personally, I've always wanted to see an AU where Ben gets the Omnitrix at the age of 15 instead of 10 making him a teenager superhero similar to Christopher Powell/Darkhawk from Marvel or Jaime Reyes/Blue Beetle from DC as both of them got artifacts from space but there are some differences compared to the Prime Universe:
- The pod that contains the Omnitrix was crash landed in Bellwood in an abandoned area where Ben saw it while he riding back home in his bicycle. Like imagine an abandoned street block or a factory.
- Ben and Gwen already went on a summer vacation with Max from when they were 10 and did the same as well the next year after. So meaning, this AU takes place outside of the summer season like either in spring or fall.
- Gwen is already associated with magic as she got one of the charms of Bezel but uses it as an accessory while being unaware of its magical properties. Though I'm not sure how to write it properly without breaking the continuity by adding plot holes such as 'Why Hex or Charmcaster never came after it despite having 5 years of opportunities to take it ?'
- In that AU, Ben is keeping a secret identity while keeping his Omnitrix hidden from the public by using a long sleeve from his jacket or coat because outside of the 2005 show we barely got to see the idea of Ben's secret identity been taken seriously including the fact that it got easier ever since his identity was exposed in UA and became a celebrity.
The only thing I don't want from this AU is Ben struggling with relationship issues and pulling a Terry McGinnis from Batman Beyond where he said he would try to be better after missing a couple of dates but only for him to make the same mistakes later on while also cheating on his girlfriend similar to what Terry did to Dana with Melanie.