Nano

Nano was a Lirin who served in Starfleet during the 23rd century, the only one of his kind to do so. Like all members of his race, Nano is a skilled pyrotechnic, able to mentally generate fires.

The Lirin culture has a delicately balanced finite population where everyone serves a specific function. After making contact with the Federation in 2225, the Lirin generated Nano to serve as their emissary to the Federation. This meant Nano could never return home, as he would disrupt the balance.

Nano served as senior communications officer on the USS Enterprise under Captain Christopher Pike. He was part of the away team to Rigel VII in 2254, where he was injured.

In 2255, Nano was summoned back to his homeworld, after the unexpected death of a member of the Lirin Unity. Nano was to act as replacement, but the shared consciousness of the worldmind repelled his attempts to rejoin it. With the help of Spock and Jose Tyler, he learned that the deaths were outbursts of the Unity's uncontrollable fear of the outside world. He suggested the insular Unity ask the Federation for help, and he rejoined the Enterprise crew.

Inconsistencies
Nano, like many other members of the Enterprise senior staff under Pike, presents a problem in that there at least two other estsblished senior communications officers under Pike in the same time period: Zacharia and Dabisch.