I would like to analyze how many aliens have appeared until now in "Ben 10 Omniverse". There are a few things I would like to mention:
1º) Old aliens that haven't appeared yet in the series:
+ Blitzwolf: Already confirmed its return in "An american BenWolf in London".
+ Frankenstrike: Already confirmed its return in "Max's Monster".
+ Ghostfreak: I guess it could debut in the 5arc, considering this will be a "Halloween's arc".
+ Buzzshock: Apparently confirmed its return in "Max's Monster".
+ Spitter
+ Jetray
+ ChamAlien
+ Fasttrack
2º) Aliens still to make their official debut in the series:
+ Snakepit: Could it be Ssserpent's species?
+ Sandbox
+ Shellhead
+ Rocks
+ Squidstrictor
3º) Aliens already debuted but they need more appearances:
+ Toepick: Only one appearance, so I would like to see it again and discover if it has any other ability besides having a nightmish face.
+ UpChuck Murk: I prefer this version (from AF-UA) that the Perk (from the original series).
+ Upgrade: I really want to see this guy more often, as we haven't seen it since the original series, except in the Rex Generator's crossover. I really miss this classic.
+ Swampfire: One of my favourites from AF-UA, so I want to see him again.
+ Chromastone: Same as Swampfire.
+ Pesky Dust: Now that we have discovered its powers, I want to see it more often. An alien that can control dreams sounds really funny for someone like Ben.
+ Walkatrout: We have seen Pesky Dust's potential, so I hope we will see the same for this guy.
+ Molestar: Same as Walkatrout.
+ The Worst: Same as Walkatrout.
Well, opinions?
1º) Old aliens that haven't appeared yet in the series:
+ Blitzwolf: Already confirmed its return in "An american BenWolf in London".
+ Frankenstrike: Already confirmed its return in "Max's Monster".
+ Ghostfreak: I guess it could debut in the 5arc, considering this will be a "Halloween's arc".
+ Buzzshock: Apparently confirmed its return in "Max's Monster".
+ Spitter
+ Jetray
+ ChamAlien
+ Fasttrack
2º) Aliens still to make their official debut in the series:
+ Snakepit: Could it be Ssserpent's species?
+ Sandbox
+ Shellhead
+ Rocks
+ Squidstrictor
3º) Aliens already debuted but they need more appearances:
+ Toepick: Only one appearance, so I would like to see it again and discover if it has any other ability besides having a nightmish face.
+ UpChuck Murk: I prefer this version (from AF-UA) that the Perk (from the original series).
+ Upgrade: I really want to see this guy more often, as we haven't seen it since the original series, except in the Rex Generator's crossover. I really miss this classic.
+ Swampfire: One of my favourites from AF-UA, so I want to see him again.
+ Chromastone: Same as Swampfire.
+ Pesky Dust: Now that we have discovered its powers, I want to see it more often. An alien that can control dreams sounds really funny for someone like Ben.
+ Walkatrout: We have seen Pesky Dust's potential, so I hope we will see the same for this guy.
+ Molestar: Same as Walkatrout.
+ The Worst: Same as Walkatrout.
Well, opinions?