Nhan

Commander Nhan was a 23rd century female Barzan Federation Starfleet officer. During her career, she would serve on at least two Federation starships, the USS Discovery and the USS Enterprise (NCC-1701).

Serving on the Enterprise
By the late 2250s, Nhan was serving as an engineer aboard the USS Enterprise (NCC-1701) under  Christopher Pike, holding the rank of Commander. Being Barzan, Nhan relied on an augmentation, visible on both of her cheeks, to be able to breathe in the atmosphere maintained aboard Starfleet ships. 

Serving on the Discovery
Along with Evan Connolly, she accompanied Captain Pike onto the USS Discovery when the Enterprise suffered a malfunction. She was also a part of the team that investigated the crashed wreckage of the USS Hiawatha. 

Nhan later transferred to the Discovery and served on the bridge crew, later assigned as chief of security. 

Nhan accompanied Michael Burnham and Airiam to board Section 31 Headquarters, which led to a series of events where she had to eject Airiam from the airlock before could take the Sphere's data. 

She attended Airiam's funeral afterwards, and later apologized to Burnham for her actions. Burnham assured Nhan that she did the right thing. 

When it was decided that Burnham would take Discovery forward to the 32nd century to prevent Control from seizing the Sphere data, Nhan decided not to resume her post on the Enterprise, but was among a group of crewmembers volunteering to join her, even knowing that there was no chance to return. 

Nhan helped $𝜇$ in neutralizing Leland (reanimated by Control), when "he" boarded the Discovery to take the Sphere data. After the Discovery disappeared from its original timeframe, Nhan, along with the rest of the volunteering crew, was presumed dead by Starfleet, based on the testimonies of the USS Enterprise (NCC-1701) senior officers. 

Memorable quotes
"I see where the Federation puts its pennies."

"Do not covet thy neighbor's starship, commander. Besides, we've got the new uniforms."

"And lovely uniforms, they are. Captain."

"Very colorful."
 * - Nhan, Christopher Pike, Saru, and Michael Burnham on the Discovery and new Starfleet uniforms

"Commander."

"Hey."

"I just...Look, my job is to preserve as many lives as possible at any cost. But what you said at the service...It is hard to let go."

"You did the right thing. I'm grateful you were there."

"Strange way to get to know someone, but...after seeing how hard you fought for her, the real her...Let's just say I'm grateful you were there, too."
 * - Nhan and Michael Burnham on Airiam's death

Background information
Nhan was portrayed by actress Rachael Ancheril.