Kingdom Hearts III
While in the Kingdom of Corona, Sora encounters an idle Reaper, which appears as a large white flower bud, and investigates it to see if it is dangerous, although the Reaper remains idle and he passes it off as safe. When he lets his guard down, the Reaper emerges from its idle state to attack Sora and his friends along with various other Reapers that appear, causing Sora to encourage Rapunzel and Eugene to seek safety deeper into the forest. Sora defeats the Reapers, prompting Marluxia to reveal himself to Sora.
Later, during the festival in the Kingdom, several Reapers along with other Nobodies appear to harass Sora, Donald, and Goofy while they watch the lanterns. Meanwhile, when Rapunzel is by herself, Marluxia uses two Reapers to intimidate her into running back to Mother Gothel.
Reapers appear in two different forms. When idle, or when taking a defensive stance, they appear as a large, silvery-white flower bud, similar to certain features in Castle Oblivion. They have long, pointed petals shaped like the spikes of the Nobody emblem, which flow naturally into a short, twisted stem that splays out into "roots" with the same spiked shape.
When offensive, the petals of the bud open, revealing a humanoid head and torso, wearing a jacket with oversized, pointed shoulders and long pointed hood of faded pink. It also wears wide, elbow-length mittens that fade from pink to white. In battle, it wields a scythe similar to Marluxia's Graceful Dahlia, with a large, pink blade with an upturned tip and multiple spikes resembling the Nobody emblem.
Their name is derived from the Final Fantasy Grim Reaper entity, who like Marluxia wields a scythe and is associated with Doom spells. They are also the only high-ranking Nobodies not named after a job class at the time of their debut: the scythe-wielding Reaper job did not appear until Final Fantasy XIV: Endwalker, two years after the release of Kingdom Hearts III.
When fighting Reapers, it is a good idea to make frequent use of Fire magic, which Reapers are weak to, in order to deal a hefty amount of damage from a distance. Fire magic can also be used to interrupt the Reapers while they are warping, using Flare Dance, or getting ready to use Thorn Whip. Watch for when the Reapers are frequently warping around, as this signals their next attack.
After hitting its revenge value, the Reaper will warp away and counterattack with either Leaf Slash or Flare Dance. After counterattacking twice, the Reaper's revenge value will not increase for 20 seconds.
Consider using magic or simply dodging when the Reapers use their Leaf Slash attack, as their unpredictable movement pattern can cause you to mistime a block and get hit as a result.