Custom entity?

[void pilot]

A custom entity with ai and custom model

[void pilot]

Id possible

[teal hemlock]

Not possible to create a fully custom entity but you can fake it pretty convincingly.

Here's an example using a wither skeleton as a base entity (pathfinding, targeting, hitbox) with attack logic controlled through functions and a custom model made with item displays:
https://cdn.discordapp.com/attachments/1435909929754955796/1514371023242399804/2026-06-10_16-48-10.mp4?ex=6a46ceeb&is=6a457d6b&hm=8371b9d399eb66e0959651c7308b3e3ad47a428f1babacb7f80af141ed3fbaca&

[void pilot]

I wanna have roam around randomly and chase after player

[teal hemlock]

That should be easy enough

check out animated java, it lets you create a model with animations and export it to a datapack + resource pack

the rest of the logic can probably just be normal mob AI like a zombie

[void pilot]

Are cutscenes possible

And os there a list for all advancement criteria

[severe crypt]

With work, yes

[severe crypt]

Wiki page: https://minecraft.wiki/w/Advancement_definition
Generator: https://misode.github.io/advancement/

[void pilot]

Ho2

[void pilot]

How

[teal hemlock]

You need to first create your custom mob model, and then decide if you want to either:

• Use an invisible base entity like a zombie under your custom model to control pathing, targeting and hitboxes, then manipulate the entity's behavior with functions
• Create the ai entirely from scratch using functions (which can be much harder and cause more lag depending on how complex you want your mob to be)

You'll need to put it work either way

And like I said before, if you want custom animations you can check out the animated java blockbench plugin which will export your model and its animations to a datapack and resource pack, which can then be controlled with functions