Psylocke was originally a telepath, had limited precognitive abilities, and was a psycho-blaster, able to direct mental energy as destructive mind blasts. After a brief period as Captain Britain -- in CB (2nd series) #12-13 -- she was blinded by Slaymaster, and later received bionic eyes from Mojo in New Mutants Annual #2 which could compensate for intense light.
Matsu'o later commissioned Spiral to exchange Betsy's mind with the assassin Kwannon, and Psylocke gained a new Asian body with depleted power levels and the ability to generate a psychic knife in Uncanny X-Men (1st series) #256. After Kwannon died in X-Men (2nd series) #31, her full potential returned.
When Archangel and Doctor Strange saved her life using the Crimson Dawn in Uncanny X-Men (1st series) #330, Psylocke manifested mystically enhanced fighting skills and shadow-teleporting powers. Months later, in X-Men (2nd series) #78, Betsy was forced to shut down her telepathy in order to keep the Shadow King trapped within her mind. Later still, in an as-of-yet unexplained incident, her telepathic powers were transplanted into Jean Grey in exchange for Jean's own telekinetic abilities.
Psylocke was killed by Vargas in X-Treme X-Men (1st series) #2, but spontaneously and mysteriously resurrected on the same spot in Uncanny X-Men (1st series) #455.
As a member of the Australian X-Men, Psylocke was once rendered invisible to all forms of electronic detection.
Her middle name was revealed in The Pulse: House of M Special #1.