[1.16.4] Overhauling existing entity

[Nimi142]

I want to take an existing in-game entity and replace it's code (I don't want to change the textures and appearence at all) with mine.

 

Everywhere I look I see only how to register a new entity.

If I cannot simply replace an entity, how do I remove one from the game? If I can do that, I can just mimik the name of the one I want to replace. 

 

I would also like to have information about how to link my replacement to the entity's spawn egg.

 

I can supply code if necessary, but I didn't do much, I am still mostly planning so I don't think much would help.

 

Thanks!

Edited January 9, 2021 by Nimi142
Added version to title

[Nimi142]

I want to change the spawn conditions as well. Will removing the entity entirely and creating a new one that inherits it be better?

If so, how do I remove this entity from the game? I suppose I can stop it from spawning by using "EntityJoinWorldEvent" and removing it everytime it spawns, but I would like to remove it's egg and stuff as well. Is such a thing possible?