A Ben10 modpack around "Matterfall's Ben10 Addon"-(Click Here For The Addon)
Personally I think that this addon is pretty underrated mainly for the fact that it has almost all the aliens and some custom ones. It has all the Ben prime Omnitrix and Ultimatrix including Albedo's Omnitrix and Ultimatrix (UAF only) which might change in the future considering it's getting updated quite a lot. This modpack also includes the "Alien Hybrids Addon"-(Download Here) which is an additional addon to the Ben10 addon adding in the ability to become alien hybrids. Both of these addons are made by the amazing Matterfall_rq2003 so go show him some love by joining his Discord Server.
P.S-This is my first ever modpack so I hope you enjoy it, if you have any feedback please comment them below thx :)