Information on the biology and appearance of Millions Knives in Trigun Stampede (2023).
Basic Physiology | Clothing | Foot and Hand Knives | Gate Cloak | Hair | Knife Tentacles | Music | Personality | Plant Communication | Plant Fusion | Plant Markings | Plant Wing and Flight | Strength and Agility
Fusion With Tesla
When Knives is a preteen, we see that Tesla’s eye is embedded in the blades. At some point before this, likely before The Big Fall destroyed SEEDS05, Knives took Tesla’s eye and possibly the rest of her body parts and merged it into his own body. This shows that Knives has the ability to fuse with other plants, as he does in the Trigun manga.