I have posted a total of 6 Fan-Made Minecraft Mobs
This is the first Mob Battle I'd ever made
Now let's see who wins and go meet the contestants first!

Note: I'm using making random scenarios and giving each a number then using a random number generator, this is not rigged
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Contestants:
Magma Zombie - Magma
Lava Zombie - Lava
Fog Giant - Fog
The Grimoire Wizard - Grimoire
Creepling - Creep
Bushcrawler - Bush

Arena:
The battle would unfold at Lava Lands, a biome with many pools of Lava connecting underground, as well as lots of solid ground.

Battle:
The Mobs are released from their cages as they charge into battle, except for the Fog who is still currently roaming around in his cage. Lava dives straight down into the lava avoiding Grimoire.

Creep decides to run back into his cage for some weird reason. On the other side of the Arena, Magma is giving pursuit to Bush. Bush accidentally steps into the lava and is left on 2 Hearts. Grimoire activates his ability: Curse Of The Pumpkins, but luckily there is none at Lava Lands.

Fog finally roams out of his cage as he slams into Bush, he picks up Bush and yeets him into the lava where Lava came in for the finishing kill. Creep suddenly shot a blob of explosive venom at Grimoire who is blasted into the lava. Grimoire summons 15 Skeletons, Lava comes swimming quickly towards Grimoire but is suddenly surprised by the Skeletons. The Skeletons surround Lava before she is able to escape, the Skeletons die in the lava not long after killing Lava.

Fog rushes towards Grimoire suddenly (Foggy Beast), picks him up and eats him before Grimoire can do anything. Now with Grimoire gone, surely the winner would be Fog.

Creep suddenly comes out of nowhere and starts shooting blobs of explosive venom, Fog is turns quickly towards Creep and roars shooting a foggy beam, which misses. Magma hits Fog from behind but Fog turns around again and tosses him away into the lava.

Magma manages to get out of the lava before dying but is left on 7 Hearts, Creep suddenly appears again and shoots at Magma who explodes and dies. Fog grabs Creep and ... (Me pausing to write down scenarios and going to the number generator)

Punches him, Creep is knocked into the lava and ... (Me pausing again)

Dies slowly...
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Seriously