My Hero Academia vs Jujutsu Kaisen
Connection:
Both are villains in wildly popular Shonen series who honestly have a very similar character arc. They speak of profound and nuance theories and philosophies of the soul and of heroism, but they are spoken by childish and immature forces of destruction. However, unlike the other villains in their series, they represent the villainy of humanity. The ability to grow, adapt and evolve. And so, after coming face to face with the protagonist both are forced to grow, to become more solid in their themes and their abilities to match their polar opposite in the series main protagonists (Izuku Midoriya and Yuji Itadori respectively)
Both have the ability to destroy a person's body with a touch (Idle Transfiguration and Decay respectively), and can swell their limbs to incredible sizes for strong melee attacks. They also have a very clear visual symbolization of hands (Mahito's Domain Expansion literally has hands and Shigaraki wears them all over his body)
Both also had their bodies absorbed by the bigger villain of their series and one who they were allies with (Kenjaku and All For One respectively)
However, the contrast is that while Mahito only represents the cruelty and evil of mankind, Shigaraki also represents its strength. The strength of community, of loyalty and of resiliency. He represents its upsides as well as it's downsides, while Mahito as a cursed spirit only represents its evil
