The Komaru are the Royal Bloodline of the kingdom that bears their name. While the main Komaru bloodline was decimated in the Interregnum, many cousins survive. For the most part, the Komaru are the personal attendants and functionaries of the Crown Prince and his family. Generally, they sacrifice their personal ambition in the service of the Crown Prince, but there are many legends of Komaru cousins who split off to found their own family or even challenged the Crown Prince for the throne.

While Komaru scions are expected to sublimate their ambition in favor of the Crown, they are not expected to surrender their passion. From a young age, all Komaru are encouraged to find a specialty, an area of study or endeavor that they can devote their lives to. Although Komaru folklore speaks of nobles born to a particular end, most Komaru actually change their goals several times during their lives. In this fashion, the Komaru family is effectively able to amass in-depth information on a wide range of topics.

Most Komaru spend a good deal of time keeping track of each other's specialties. Most often, this effort provides a constant arena for gossip as Komaru nobles argue about the merit of each other's specialties. When a Komaru needs information on a new topic, it also allows family members to quickly determine the right source for assistance. As a result, the family as a whole is able to function as an encyclopedia of sorts, providing a broad range of information to all of its members and the Crown itself.

The rift between the nouveau nobility and their traditional counterparts is particularly deep in the Komaru family. By number, most of the Komaru are young nobility, and favor names of Latin French origin, with some Italian influence. Many of these youths idolize Crown Prince Alessandro, and have chosen to specialize in such unconventional areas as trade, firearms, and arcane research. In contrast, most of the family's power lies in the hands of a few titled conservatives. The clashes between these two groups over matters of propriety and duty are legendary in the Royal Capital.

The final role the Komaru play in the kingdom is one that provokes many of the family's clashes. By tradition, Komaru are expected to marry to the political advantage of the entire family. Historically, the right to determine political advantage was the domain of the family's elders. However, the Crown Prince is known to use this custom to maintain strong diplomatic ties to all of the noble houses of Komaru. Even the Royal Council will sometimes invoke the right, generally to ensure a clean line of royal succession. With so many groups struggling to use the Komaru children as political pawns, many are promised in marriage before they can walk. As court politics change, these nuptial pacts are frequently broken, and most Komaru have been engaged three or more times before they finally marry.

While many of the nouveau nobility complain about the practice, most of the Great Families see it as a way of ensuring prestigious marriages into the Royal Family. As such, they are in no hurry to see the custom abolished. Many nobles have found their own solution to the problem: several members of the family now devote themselves to tracking the increasing number of illegitimate children possessing a Komaru bloodline.

House Komaru's colors are royal gold, white, and copper.