The Gigas are mechanical enemies featured in Verum Rex, a fictional franchise featured in Toy Box, a world from Kingdom Hearts III based on Toy Story. Action figures of Gigas also feature as enemies and a gameplay element.
Kingdom Hearts III
When Sora and his friends go to Galaxy Toys, they spot several Gigas figurines and ask Woody why some toys are immobile. As Woody explains toys have yet to figure it out, Young Xehanort appears and summons several Toy Troopers to pilot the Gigas and attack them. In response, Donald and Goofy convince Sora to pilot the Gigas himself to fight back.
Several Gigas feature as enemies in Verum Rex: Beat of Lead, where Sora is forced to fight them after Young Xehanort throws him into the game.
Kingdom Hearts III Re Mind
The Gigas come in three varieties, each with differing and similar abilities. When piloted by Sora, all types have a blaster, booster rockets for flight, and a punch attack. They also possess a Mag Assemble ability, allowing Sora to manipulate and move blocks.
In Verum Rex: Beat of Lead, "Ace" Gigas appear, being stronger than the usual variants. In addition to Ace versions of the standard three types, "Little Ace" Gigas are smaller variants that have no special abilities. The final opponent in Beat of Lead is the "Hyper Ace" Gigas, a golden variant that possesses the unique abilities of all three standard classes.
During the boss fight with Yozora, as part of his ultimate attack, he will summon several Ace Gigas to rush Sora. They are unblockable and have enough health and defense to not be destroyed by any physical attacks. Dodging or casting Magic is the only way around them.
Kingdom Hearts III
When facing them on foot, Gigas are some of the most dangerous standard enemies in the game. They each have massive health, powerful attacks that hit a wide area, and won't flinch from basic attacks. It is thus not advised for Sora to fight them unless at a very high level. Sora should take them on while piloting a Gigas, or simply flee.
The Power class prefers to get up close and use powerful physical attacks, but has weak cannons. The Gunner class has powerful long-range attacks, but low health and can be floored from a single punch. The Speed class has balanced stats and prefers to move a lot while launching Exploder blasts.
When a Gigas is defeated, it remains in place for 60 seconds, then vanishes. While it remains in place, Sora can board and control it.
If Sora's Gigas is destroyed, he should retreat and focus on finding another Gigas.