Cachino is a member of the Omertas family working in the Gomorrah casino. When talking to him at first he is extremely rude. After reading his journal or talking to others in the Gomorrah, the player discovers that he does many things behind the Omertas' back that could get him killed if they were to find out. He also has a room in the Gomorrah and is mentioned by Joana during the quest Bye Bye Love. According to her, Cachino is sadistic. He has repeatedly brutalized and raped her and some of the other working girls. These perversions along with his side deals are detailed in Cachino's Journal.
Cachino will not spawn unless you've either finished the quest Bye Bye Love or you've talked to Yes Man and have inquired about the Gomorrah 'Tribe' after Yes Man has explained about how you could determine the fate of New Vegas yourself. He will mention something about Benny paying the Gomorrah receptionist for intel. This will open up the option to 'collect' on some outstanding payments at the receptionist of the Gomorrah. Cachino will then have spawned.
Cachino is referred to both as a Lieutenant and a Captain.
If Cachino has not spawned, the map marker will point to the arch just in between the Casino and Reception.
After the deaths of Big Sal and Nero, Cachino will appear on a Radio New Vegas news bulletin and comment that Nero always wanted to, "Sleep with the lakelurks". This is a reference to the film The Godfather where, following his murder, Luca Brasi is said to "sleep with the fishes".
ps3 Towards the end of the quest How Little We Know, Cachino will offer you a gun to kill Big Sal and Nero, when you ask Cachino for the gun just before the fight his head may start to spin round in a very creepy way, this can be resolved by ending the chat with him and then talking to him again.