#I mean female Tetramands (Four Arms' species) are canonically stronger than the males so

[coinsweepermaster]

The 10 aliens the batfam would use the most if they had an Omnitrix (+ headcanons)

Dick - Fasttrack, XLR8, Jetray, Ditto, Crashhopper, Astrodactyl, Spidermonkey, Chamalien, Shocksquatch, Whampire (he mainly uses Whampire to make fun of Bruce)

Jason - Heatblast (Jason used Heatblast to get revenge on Roy for the flamethrower-in-the-shower thing), Ghostfreak, Juryrigg, Humungousaur, Kickin Hawk, Bullfrag, Water Hazard, Ampfibian, Diamondhead, Rath

Tim - Grey Matter, Brainstorm, Big Chill (Tim finds it hilarious whenever he's mistaken for Blue Beetle), Upgrade, XLR8 (he occasionally races with Bart; Dick does the same with Wally), Astrodactyl, Atomix, Clockwork (he uses Clockwork whenever one of the Flash's mess with the timestream), Gravattack, NRG

Damian - Diamondhead (Damian once used Diamondhead to make a sword for himself when he was human again; as of now, it's one of his deadliest weapons), Blitzwolfer (he used Blitzwolfer to try to talk to his pets once; he was annoyed when it didn't work), Swampfire, Rath, Echo Echo, Ghostfreak, Cannonbolt, Artiguana, Jetray, Wildmutt

Steph - Chromastone (she uses Chromastone mainly bc he's purple), Blitzwolfer, Ditto, Goop, Fasttrack (she found Fasttrack when she was running to her college class bc she was late), Feedback, Crashhopper, Kickin Hawk, Buzzshock, Swampfire (she has used the 'disarmed' joke 50+ times (Tim counted))

Cass - XLR8, Artiguana, Snare-oh, Big Chill, Four Arms (this is her strongest form), Pesky Dust (she uses Pesky Dust whenever one her siblings doesn't sleep for a few days (she has also used Pesky Dust on Bruce)), Fasttrack, Crashhopper (she used Crashhopper to finally defeat Cricket; Tim and Stephanie high-fived her when they learned about it), Ghostfreak, Jetray

Duke - Diamondhead, Heatblast (he used Heatblast once to make smores for himself and the We-Are-Robin crew (it ended with the building they were in being burned down)), Water Hazard (he used Water Hazard to extinguish the flames after the building burned down), Armodrillo, Gravattack, Clockwork, Swampfire, Ripjaws, Brainstorm, Eye Guy

Harper - Upgrade (you know that vending machine chart? basically that but at the bottom there's an option where it says "tries to dial Upgrade on the Omnitrix by using their head"), Juryrigg, XLR8, Brainstorm, Water Hazard, Feedback, Astrodactyl, Kickin Hawk, Nanomech, Lodestar

Barbara: [quick note: when Barbara turns into an alien, she's still paralyzed] Grey Matter, Brainstorm, Nanomech, Lodestar (she has used Lodestar multiple times to move her wheelchair at high speeds), Swampfire, Jetray, Big Chill, Astrodactyl, Goop, Upgrade

Kate - Heatblast, Diamondhead, XLR8, Four Arms, Kickin Hawk, Astrodactyl, Water Hazard, Ripjaws, Humungosaur, Lodestar

Bruce - Fasttrack, Brainstorm, Big Chill, Upgrade (he's used Upgrade multiple times on the Batmobile), Humungousaur, Astrodactyl, Swampfire, Gravattack, Goop, NRG

Bonus:

In an au where Cullen got The Omnitrix after some Shenanigans, his most used aliens are: Wildmutt, Echo Echo, Four Arms, Upchuck, Ampfibian, Clockwork, Bloxx (instead of calling him Bloxx tho, Cullen calls him what you say when you step on a lego: Son of a bi-), Crashhopper, Bullfrag, Cannonbolt (Cullen usually uses him to play what the batkids call "Super-size bowling")