Minecraft wiki entry for Giant, associated text: Because giants need to have a light level both less than 8 and greater than 11 to spawn, they don't spawn from monster spawners. However, this spawn condition can be bypassed with a custom spawner, if it attempts to spawn an entity with valid spawn conditions riding a giant.
Iron golems have the same HP as these mobs.
If the player names a giant using a name tag, its name appears inside its head.
Giants share the exact same model as the zombie. This means that changes made to the zombie model (for example, using a resource pack) change the giant's as well.
Notch mentioned Giant Zombies as a suggestion for a prefix mob along with other examples: "Burning Spider" and "Cobble Creeper" in a Bro-craft stream.
Notch removed the giants spawning capabilities because "they are too overpowered". He did not remove them entirely because "they are just too cool to remove".
If a giant is riding a minecart, it hovers way above it.
If a mob is riding a giant, unless it's a large slime or magma cube, a ghast, or the ender dragon, it is hidden inside the giant's head.
Giants have the same hurt sound as the player does.
Players are unable to attack a giant's head and torso unless they are positioned near the bottom of the giant. Projectiles such as arrows can hit these areas as normal.
Giants, being capable of dealing 26 × 13 to 75 × 37.5, and having 100 × 50 health, are capable of killing players without armor in one hit even in Easy difficulty.
This was found by looking through the Attributes data.
This also means they can OHKO piglin brutes in Normal difficulty.
Giants may spawn naturally in some dimensions from the Java Edition 20w14∞ snapshot, as well as Illusioners, this is due to the fact that the multiple dimensions from this snapshot have random mob spawn properties.
Killing a Giant cannot give the player the Monster Hunter Achievement.