The Karma Seal's True Purpose: The unique diamond-shaped mark on Boruto's hand and face is known as the "Karma Seal." It's not a power he inherited but a mark given to him by the Ōtsutsuki clan member, Momoshiki, after Boruto defeated him. The seal contains all of Momoshiki's genetic data and consciousness, essentially turning Boruto into a vessel for the Ōtsutsuki to be reborn.
A Different Eye Power: Unlike his mother Hinata, who has the Byakugan, Boruto possesses a unique dōjutsu called the Jōgan (Pure Eye). This eye is a blend of the Uzumaki and Hyūga lineage and allows him to see chakra, sense negative emotions, and even perceive rifts in space-time that are invisible to others.
Paying Homage to His Master: Boruto's design, especially in later stages, incorporates a tattered cloak and a sword. This is a deliberate nod to his mentor and father's rival, Sasuke Uchiha. The look symbolizes his dedication to following in Sasuke's footsteps and becoming a "shadow" to protect the village.
Symbolic Headwear: The headband Boruto wears is not his own. It's a Konoha headband he received from Sasuke. It's a symbolic item that marks his progression as a ninja and his commitment to protecting the Hidden Leaf Village, something he initially struggled with.
The "Two Blue Vortex" Design: This specific design, with the activated Karma and a more mature, scarred look, is from the Boruto: Two Blue Vortex manga series. It represents the time-skip and a significant shift in the character's journey, where he has become a more serious and formidable ninja.