An Honolulu PD officer in Honolulu, Hawaii, he has both the confidence – and the will – of someone who's had to fight every step of the way. He spent two years working undercover.
- Magnum often consults with Katsumoto, who resents, but often accepts, Magnum's assistance.
- He is an HPD officer and nobody gets in his way.
- In the original show, the character was played by Clyde Kusatsu (who also portrayed other recurring characters in the show, Colonel Ki and Dr. Long Tang).
|I Saw the Sun Rise||From the Head Down||The Woman Who Never Died||Six Paintings, One Frame||Sudden Death||Death Is Only Temporary||The Cat Who Cried Wolf||Die He Said||The Ties That Bind||Bad Day to Be a Hero||Nowhere to Hide||Winner Takes All|
|Day of the Viper||I, The Deceased||Day the Past Came Back||Murder Is Never Quiet||Black Is the Widow||A Kiss Before Dying||Blood in the Water||The Day It All Came Together|
|Magnum P.I. Characters|
|Current||Thomas Magnum • Juliet Higgins • Rick Wright • Theodore Calvin • Gordon Katsumoto • Teuila Tuileta|
|Other||Noelani Cunha • Duke Lukela • Kamekona Tupuola • Flippa Tupuola • Sebastian Nuzo • Icepick • Luther Gillis • Buck Greene • Kenny "Shammy" Shamberg|