Powers: He had limited weather control powers and could absorb electromagnetic fields and release them as blasts from his cybernetic arms. A running gag from his earlier appearances is that his powers were never shown on panel because of their complicated explanation. Cyclops remarked as he blasted Katu in Excalibur #72 that someday he'd like to see Katu use his powers.
Bio: He was a member of the Acolytes, a fanatical group of mutants. In the earlier issues of Cable vol. 2, , it was established that he is a long-hated enemy of Omega Red, who had in the past murdered Katu's entire family.
Katu has not been seen after Cassandra Nova's Sentinel destroyed Genosha, killing 16 million mutants. Though nothing has been proven or officially stated, Katu may have been one of the millions of mutants who died during this assault. If this is the case, then his death occurred off-panel.
Notes: In some comics, his codename is misspelled "Kath". Years later in the marvel official handbooks, it was established that misspelling was part of his real name. His real name is finally confirmed in X-Force #21.