Extra Effects for Mobs

[hybrid oyster]

So, I'm wanting to make a mob that basically creates something else when it does an animation. If I wanted to make this extra model that it summons would I make it with the main model of the mob, or create it as a completely separate item?
I don't want to go too far ahead in the design process and not be able for it to work when I'm trying to add it to the game.

[sharp tendon]

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[hybrid oyster]

For context I want this mob to create something like a tornado from a part of its body

[gaunt snow]

does a tornado have to move somewhere after summoning, or is it gonna stay in one place?

also, does it supposed to interact with the player?

[hybrid oyster]

It's basically supposed to stay connected to the mob but it moves along with it, and it does interact with other entities

[gaunt snow]

how does tornado supposed to interact with other entities?

[hybrid oyster]

I either want it to pull them toward it or spin them around

Or both

[gaunt snow]

hm

if you know how to summon an entity after animation, it's better to summon tornado as an separate entity, because it's easier to detect collisions with it, and you can also move it independently from a mob if you want to

Also I am a datapacker, not a modder, so maybe that isn't right