So how many powers does Jack-Jack canonically have?
Here's a list of each power in the order that they are seen in the two films and two mini-movies.
Jack-Jack Attack
1. Teleportation: moving immediately from one location to another
2. Gravity manipulation: allowing him to float, sit on ceiling
3. Abnormally strong teeth: allowing him to bite through his crib (subset of demon baby?)
4. Ability to phase through solid objects
5. Morphic ability: transform into fire
6. Ability to produce lasers from eyes, either continuously, or in "blaster" mode later on
The Incredibles
7. Morphic ability: transform into metal
8. Morphic ability: transform into demon
Incredibles 2
9. Telekinesis: seen in ability to move the garbage can cover and later Helen's goggles
10. Likely indestructible like Bob: Bob mentions there's not a scratch on him after the raccoon fight
11. Morphic ability: transform into goo
12. Multiplication: ability to produce up to about a dozen copies of himself
13. Ability to produce lightning-type energy: the lightning effect surges around him but he doesn't seem to be able to channel this energy himself
14. Ability to rocket through air: this one also seems unintentional, as it's only initiated by Jack-Jack sneezing
16. Ability to travel through and remain in alternate dimensions: subset of teleportation
17. Imitation: ability to transform physically into other people, but in addition Jack-Jack also imitates their mannerisms
Auntie Edna
18. Speedster abilities like Dash: seen only briefly when he's stacking the blocks at Edna's house
19. Size transfiguration: able to grow
20. Size transfiguration: able to shrink
21. Morphic ability: transform into fog/mist
22. Morphic ability: transform into water
23. Firework effect: perhaps a combo of fire baby and lightning baby? Edna seems to call it electromagnetism
There may also be an undefined element of Superhuman intellect. We see that Jack-Jack has the ability to perceive and respond to threats and strategize at a rate unheard of in normal babies. He also seems to possess a higher level of spatial reasoning and design abilities (seen in his building the mannequin at Edna's house)
So what’s the final count? Depends on how you group the powers. I really don’t think he technically has 17+ different powers. The ability to transform into other things (fire, lead, water, mist, goo, or a demon), to grow/shrink, and the ability to imitate other people all fall under the category of “morphic abilities.”
It’s appropriate that Edna deems him a Polymorph because yes, he does have multiple powers, but his main power also seems to be this morphic ability, which encompasses many of his individual powers.
(Let me know if I missed any powers, or if you have other ideas for how to categorize or count the number of powers Jack-Jack has!)
