The zombie is the workhorse of custom mobs: it accepts every equipment slot, the baby flag, and passenger stacks, which makes it the mob most map-makers reach for first. Configure the armor, hands, traits and passengers visually below and the generator writes the /summon zombie command in the NBT or component form your version expects.
Version matters more for zombies than for simple mobs because equipment syntax changed twice: legacy versions write ArmorItems and HandItems lists, and Java 1.21.5 replaced both with a single equipment component. The same visual build produces different -- and mutually incompatible -- command text across those boundaries, which the version matrix below makes visible.
Plain zombie
/summon minecraft:zombie ~ ~ ~The baseline command, useful as a spawn-egg substitute in command blocks.
Baby zombie chicken jockey
/summon minecraft:chicken ~ ~ ~ {CustomName:"Jockey",Passengers:[{id:"minecraft:zombie"}]}The classic jockey is a chicken with a zombie passenger -- summon the vehicle, nest the rider. Add the Baby trait to the rider in the editor for the true baby jockey.
Armored elite zombie
/summon minecraft:zombie ~ ~ ~ {equipment:{chest:{id:"minecraft:diamond_chestplate",count:1},head:{id:"minecraft:diamond_helmet",count:1},mainhand:{id:"minecraft:iron_sword",count:1,components:{"minecraft:custom_name":"Rusted Blade"}}},PersistenceRequired:1b,CustomName:"Crypt Guard",CustomNameVisible:1b,Health:40f,attributes:[{id:"minecraft:max_health",base:40}]}A multi-feature elite: named, double health, diamond armor and a named sword, and it never despawns.
Open the equipment slots in the editor, pick the pieces, and the generator writes ArmorItems/HandItems on legacy versions or the equipment component on Java 1.21.5+. Nothing needs hand-written NBT.
Enable the Baby trait. It emits IsBaby:1b on legacy Java and the modern is_baby field where that applies.
Not through /summon -- Bedrock ignores the Java NBT payload. The generator still emits the plain Bedrock command and lists each dropped feature as a warning, so you know exactly what did not carry over.
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