Seto - Shapeshifting details/notes

Kaiba's shapeshifting uses the same technology as his latest duel disk, which is capable of producing/summoning literal monsters with the ability to destroy jet planes and wield actual destructive power. In his particular case - A literal, physical Blue-Eyes White Dragon.

Hardlight emitter: The technological advances used to summon Duel Monsters modified to emit a physical 'shell' around Kaiba, linked with his brain much like other established technology in DSoD. It is, in fact, extremely durable and has physical mass and weight- as he's summoning a literal manifestation of his Ka in this state (unknown to him, he just believes it's an extremely advanced hologram- which is nothing new to him.) And due to this being a maintained physical manifestation of his Ka, he can still experience all four of the five senses through the dragon. This he has merely chalked up to the fact that he's literally just -that- good.

Vision: A hardlight 'visor' relays the dragon's visual field to Kaiba in real time, as sight was the only sense he lacked in that state due to how he set up the entire thing, being suspended in the chest cavity of the dragon and controlling it with thoughts and not movements. Comparable to a dream-like state. **This is really an inversion of the physical and metaphysical.** He's however, aware and unlike Kisara (who could only summon blue-eyes while unconscious) he is in complete control. It becomes a second body, which he is very comfortable with.

Physical strength: 5A - As this is still a Blue-Eyes White Dragon.
Source: https://vsbattles.fandom.com/wiki/Blue_Eyes_White_Dragon - More details found here.
He has the ability to outclass servants. And due to being a dragon, the factor of mana generation may also be considered. And due to Seto's ancestor being a priest, and the presence of magic in the Yu-Gi-Oh universe, it is theoretically possible he has mana compatible with other series like Fate. (He just... refuses to admit he believes in magic or he doesn't believe in it at all past admitting some weird shit happened when he was younger. He will attempt to explain everything scientifically first and foremost.) It can be discussed beforehand or at the whim of the typists, since it wouldn't necessarily be too strange.