In spite of what was wanted by the Selachii's creator, the first of it's creations took a different path, intending to into only imbue it's creations with the powers of magic that followed throughout Mundus, but a connection to other forces that it saw within the world, and they were to embody these concepts in part, but it was a hope of Nisshoku, that they would be so, so much more.

A point of pride and respect for a majority of Selachii, as nearly all members of the race hold such for their family. Some of the most well known of these hold their roots within the race's time in Akavir, and have either survived to this day with a degree of prominence, or in the least, still exists to some degree. Some currently existing bloodlines are the result of at least two of these lines intermingling, which the race has no bias against.

Shirogane(Primal Line) - The most prominent bloodline originating in Akavir, this line held the reigns of Royalty among the Selachii, lasting for several hundred years on the continent. Possessing several well known Selachii, including Himiko, the last known ruler in Akavir, the line is known as one of few to inherently maintain a connection to legend, as the line has seen a few members that may include a link to the race's connection with Dragons. Many members of this race commonly serve in matters of state, as members of the race's Navy, or in other professions common among the race.

By the Fourth Era of Tamriel, a number of bloodlines are known to have branched from this, some with even minor differences - but all of them harken to cores of courage, power, and wisdom.

Kai(Primal Line) - Second in prominence to the Shriogane line, this family has maintained a good relationship with the former since the race's time in Akavir. A consequence of the race's change in leadership upon arrival in Tamriel, this family has become just as prominent as their aforementioned allies since the late second Era, and have been known for their aptitude with matters of Military/Naval might and currency. 

Morimoto - The least prominent of the three bloodlines surviving the trip to Tamriel, this line is most well known for their affinity for diplomacy, and as such, many of the Selachii sent to serve on the Elder Council, or in other political matters, have hailed from this family. Currently, as of 4E 165, Daisuke holds the singular seat afforded to the race, and has doubled his efforts within the Empire, striving to instill upon the Council solutions to problems that benefit more than just his own race, where applicable. 

Kagasueki - Considered to be one of the most secretive of all Selachii bloodlines, but among those who know, understand that it has a relation to the Shirogane bloodline, and rumors suggest that this line was the only one to nearly entirely avoid the race's exodus from Akavir, with most of it's members residing on islands off the Akaviri coast.

Gozen - Originating in Akavir, this bloodline contains very few members as of the 4th Era. The name Tomoe has been used many times within this family, always in respect of the warrior who found an equal in one of the Selchii's most respected rulers, Himiko.

Setchi - As of the Fourth Era, this bloodline is all but extinct. Records suggest much of the family settled within the heart of the Empire within the years following the beginning of the 3rd Era, and various sorts of conflict meant that there were few members of the family by the start of the Oblivion Crisis.

Hatoyama - Beginning during the first few years of the 3rd Era, due to a marriage of a member of the Kai bloodline, and a Tsaesci - possibly one of the first recorded instances of this, but scholars among the race know it is not the first. Viewed by some in the Empire as the same "snakes" they are spawned from, distantly or not, nearly all members of this line are decorated sailors. Somewhat unusually, this line seems to produce Selachii with snake scales.

Kamado - One of the first few bloodlines originating after the Selachii's arrival in Tamriel, this line is an offshoot of the Shirogane and Kai bloodlines. Selachii born of this line have a few commonly seen traits, such as varying blue skin/scale tones, and orange to red hair. The line's most outstanding member in recent memory served only in assist to the Empire during the Great War, commanding his own ship under the command of Akario Shirogane, who had been named Admiral shortly before the start of the conflict.

Nakatsuka - One of the most "renegade" families, at least by more Imperial standards. Related to the Kai family, this line equally favors Naval service, producing both valuable, decorated sailors, and those who turn to varying levels of piracy. Most notable in recent memory, are two sisters of this blood line, the eldest Junko earning her merits serving her race in the Great War - but she turned down a generous promotion, in favor of being able to captain her own ship. Naming her own sister, Kaede, as First Mate(based both on familial merit, and skill), and these sisters have not been seen on Same-Shuto since. 

Sakurai - The origins of this bloodline originates both with the Kai family, and the Selachii's origins in Akavir. While the original consideration was that only three bloodlines heavily survived the races' exodus from Akavir, scholars focusing on this topic just after the beginnings of the 3rd Era found that this was not true, as this bloodline is one of a few smaller lines to survive and thrive in Tamriel. Most members of this line are known for their aptitudes in Military/Naval matters, alongside craftsmen of various sorts, from Blacksmiths to Jewelers, alongside Scholars.

Shibasaki - Beginning some time in the 3rd Era, this family became prominent for their operation of various businesses both among the Selachii, and within the Empire. The outset of the Oblivion Crisis, and the eventual shift change in the Empire saw a downturn in their operations, with much of their holdings outside Selachii territory having been lost as of the start of the 4th Era. As of the year 150, the Patriarch of the family, Hosoku, brought strength to the family, but soon became known for methods that were not appreciated. He soon became outspoken on issues such as the Selachii's involvement in the affairs of the Empire, suggesting that they should not support the ailing institution, and focus on their own instead.

Just before the Great War, the family would become nearly obscure, as Hosoku was brought before the Council in chains, his various crimes having been made public by the Shirogane family.