Although Kzinti naming conventions were not explicitly discussed in The Slaver Weapon, the naming conventions of the characters in the episode correspond to creator Larry Niven's descriptions of this in various stories. According to Niven, the Kzinti are not named at birth; they must earn their names through valorous deeds, typically ones that advance the interests of the Patriarchy. Unnamed Kzinti have lower status, and are referred to by the name of their profession, as was Telepath. Single-named Kzinti have distinguished themselves in some manner. They often follow their awarded name with the name of their profession, as did Chuft Captain. Kzinti can accumulate multiple names if they continue to perform valorously.
The Kzinti made no further appearance in Star Trek after "The Slaver Weapon", and a brief mention in The Infinite Vulcan. The council of Elysia in TAS: The Time Traphad seemingly included a prototype, perhaps ancestral, Kzinti creature with the familiar bat-wing ears. A female felinoid seen in スタートレック5：新たなる未知へ was referred to in backstage information as a "Kzinretti". Further, a star map seen in several TNG episodes has a planet on it named "Kzin".
It has often been said that an unseen species mentioned in the Star Trek: Deep Space Nine episode The Adversary – the "Tzenkethi", a near-anagram of "The Kzinti" – were supposed as a replacement. Robert Hewitt Wolfe said recently that he combined the name "Kzinti" with "Tsankth", a race from the RuneQuest and HeroQuest RPGs, in naming the Tzenkethi. Wolfe also notes that he did not picture the Tzenkethi as looking like the Kzinti, but as "heavily armored lizards".
The Kzinti also made brief appearances in the 1982年3月1日 to 1982年7月17日 Star Trek newspaper comic strip The Wristwatch Plantation by Sharman DiVono and Larry Niven with art by Ron Harris. The story involved Kzinti starting an invasion in the 2270s. The authors considered publishing the story as a novel or comic book,  but this did not happen.
In 2003年 Jimmy Diggs tried to pitch a CGI animation adventure in feature length entitled Star Trek: The Lions of the Night in which the crew of the USSEnterprise-B under command of Captain Sulu was facing an invasion fleet. The project however didn't go very far, even though it had the support of Larry Niven and the Roddenberry estate.
It has been recently disclosed that if Star Trek: Enterprise had been renewed for a fifth season, Manny Coto wanted to do a Kzinti episode. Much of the concept for the episode "Kilkenny Cats" (which was based on a story by Neal and Jana Hallford) was to draw from the earlier concept Star Trek: Lions of the Night by Jimmy Diggs. D.C. Fontana and André Bormanis were also involved in the editing of the script.
To get the producers convinced a "rough rendering" of a Kzinti starship based on the movies era Dark Stalker was produced for possible use. The artist Josh Finney said that he was "...commissioned by writer Jimmy Diggs to design an Enterprise-era Kzinti cruiser as part of an overall pitch to Paramount." He further said "As for my ship design, truth be told, Paramount's people would've probably re-designed it a billion times before it hit the screen. But, still, I would've at least provided the starting point for the concept."
It is notable that the concept design of the Kzinti vessel draws considerably from the Kzinti fleet as presented in the Star Fleet Universe, which have a similar layout to the design shown, including the same triple warp nacelle layout and pod-mounted drone (missile) launchers. Jimmy Diggs did that on purpose, hence the three nacelles, but with more emphasis on creating a believable warship. The 2150s version combines aircraft and submarines of World War II (see here).
Kzinti in novels 編集
Star Trek Log 5 by Alan Dean Foster begins with a flashback scene of M'Ress' career in Starfleet. Among one of the events is her time as a junior communications officer aboard the USSHood: The starship was attacked by a Kzin cruiser, killing all of the bridge crew including the chief engineer, and crippling several systems including engines and communications. M'Ress, who speaks little Kzinti, volunteers to beam over to the cruiser which was disabled in the counterattack. The Kzinti are sending a distress call to their homebase which needs to be cut off and M'Ress' further plan is to recode it to send a distress call of their own to a Federation starbase. Her actions resulted in a promotion to lieutenant after just two years of service and the transfer to the Enterprise. The battle was mentioned in M'ress' biography by Lincoln Enterprises where it is stated: "She entered Starfleet just three years ago", placing the event in 2266.
In The Worlds of the Federation by Shane Johnson, Kzinti are mentioned in the Caitian entry: It is speculated that Caitians are the descendants of an old Kzinti colony. Caitians are described as peaceful in nature contrary to their assumed cousins. These data points reflect the information first published in M'Ress' biography by Lincoln Enterprises.
The Pocket TOS novel Ishmael by Barbara Hambly contains a throw-away line to the Kzinti: The Starbase's commanding officer, Maria Kellogg, served as chief engineer of the USSRepublic before in her career. She was one of six Human crewmembers, the rest were Orions, Kzinti and Trisk. (Revealed in Chapter 7; story might be set during end of the five-year mission.) Later Kellogg and Kirk pass two Kzinti in the corridors of the station. Kellogg greets them in their native tongue. (Revealed in Chapter 13.)
Kzintis in the Star Fleet Universe 編集
The Kzinti race in the Star Fleet Universe – who have traits setting them apart from other continuities (cat ears, sentient females, Kzinti/Kzintis as singular/plural, etc.) from the Kzin of Niven's works – has fought wars with all of their neighbors, the Federation, the Klingon Empire and their perennial nemesis, the Lyran Star Empire. They are long-standing allies – or more accurately, co-belligerents – of the Hydran Kingdoms.
The Kzinti Hegemony eventually formed a tentative accord with the Federation, and allied with them in the General War, but they have been involved in major wars with the Klingons and Lyrans, such as the Four Powers War and the General War itself, in which a substantial region of their territory was occupied by their Coalition enemies and two full-scale assaults were made on the Kzinti homeworld of Kzintai.
Eventually with Federation assistance they forced the Coalition forces from their territory, but after the war ended they were involved in a civil war as a disgruntled faction – which had been opposed to the Hegemony's ruling patriarch and sought refuge and developed a power base in the WYN Cluster, and launched an attempted coup of the Hegemony itself in the WYN War of Return.
Also, in the fictional variant of the Star Fleet Universe as represented in the games Star Trek: Starfleet Command II: Empires at War and Star Trek: Starfleet Command - Orion Pirates from Taldren, the Kzinti were renamed and re-interpreted as the more canine Mirak.