He had an unknown number of children, one of whom was named Raifi, who caused him a number of difficulties over the years. However, Tobin could not bring himself to discipline any of his offspring, no matter what they did. (DS9: "Explorers", "Nor the Battle to the Strong", "Afterimage")
Years later, Jadzia Dax felt that Tobin had a minimal sex life and was unimaginative, but he was a skilled engineer who was known for his intimate knowledge of phase coil inverters. Tobin once tried to learn some botany, but he didn't have much luck at it – he was the only Dax host to try it. (DS9: "The Siege", "The Wire", "The Siege of AR-558")
During Jadzia Dax's zhian'tara in 2371, Miles O'Brien embodied Tobin's memories and personality. When Curzon Dax undertook the ritual, he got Tobin drunk – for the first time in his existence. (DS9: "Facets")
|The hosts of Dax|
| Lela • Tobin • Emony • Audrid • Torias • Joran • Curzon • Jadzia • Ezri|
Verad • Yedrin
Tobin Dax was played by Colm Meaney during Jadzia Dax's zhian'tara in the episode "Facets".
According to the script for "Afterimage", his name was pronounced as "TOE-bin". 
In Star Trek literature, Tobin Dax lives around the time of the events of Star Trek: Enterprise. Dax appears in the short story "Dead Man's Hand" in The Lives of Dax, in which he and Skon encounter Romulans during the Earth-Romulan War. Tobin has also appeared in Star Trek: Enterprise novels including Beneath the Raptor's Wing, where he is shown to be working on a countermeasure to the Romulans' telepresence technology. Tobin also appears in To Brave the Storm and A Choice of Futures, the latter novel seeing him working with now-Captain Malcolm Reed. In the Star Trek: Destiny novel, Gods of Night it is mentioned that Tobin saw the launch of the NX-02 Columbia.
In the novel Uncertain Logic, Tobin's pre-joining name is given as Tobin Fendus.