Lynera is a troll with a distrustful and stringent nature, immediately suspecting the MSPA Reader to be a spy when they come to meet Bronya in the Brooding Caverns. Despite the player insisting that they aren't in league with hostile parties, Lynera ignores the player's claims and continues to treat them with nothing but harshness. When the player takes her to a cafe to interact with trolls of other castes, Lynera is unable to fully relax as she has trouble viewing others with an open mindset. Apart from that, when a teal comes by to chat, Lynera remains cagey as ever and winds up lashing out at a potential friend. 

Lynera is also shown to be quite emotional; she is either incredibly angry or upset depending on the situation. Upon meeting the player, she furiously demands to know why the player thinks they could possibly be friends with Bronya, snapping that the player was nothing but a nusiance to everyone around them. When Lynera speaks about her less-than-likely chance of being matesprits with Bronya, she bursts into tears as she is visibly distressed with the nature of her current relationship with the other jade. Overall, it can be assumed that her emotions tend towards extremes, which makes her emotionally volatile and rather difficult to manage.

She also has murderous tendencies, which might be related to her unstable emotions. She has absolutely no qualms brandishing a knife in front of the player, and her study cave has ominous blood spatters here and there. When ranting about Elwurd, Lynera mentions wanting to brutally murder the cerulean for being such a terrible person to Bronya. In one of her bad endings, she attacks the player out of sheer jealousy, hissing that only she would be Bronya's friend. Yet in her good ending, she hastily informs the player that she never really wanted to kill them right after she puts them out of harm's way. 

Despite this, Lynera is very dedicated to her work in the caverns and is Bronya's second-in-command. This causes her to be somewhat reclusive, in turn leaving her with very little opportunities to leave the caverns and meet other people. She is fascinated with her duties as a jadeblood and troll reproduction, spending most of her time reading relevant tomes. Lynera is also quite a stickler for rules and organization; she mentions that she has a whole study cave to herself solely because she found rule-breaking jades intolerable. 

She is also shown to be very posessive over people in her life, and her crush on Bronya is implied to be somewhat unhealthy due to her obsession with the other jade. Lynera invades Bronya's privacy by checking her phone, and expresses frustration over the fact that numerous others would like to be friends with Bronya. As Lynera wants Bronya all to herself, this drives her up the wall. A testament to Lynera's excessive passion for Bronya would be her corkboard: numerous photos of Bronya are tacked up there, and Lynera has a notebook dedicated to documenting precious moments spent with Bronya. 

Lynera is obsessed over Bronya, and is extremely clingy over their relationship. While Lynera would rather remain as Bronya's faithful friend as opposed to outright losing her, Lynera is clearly distraught with the arrangement as there's a distinct possibility that someone else might win Bronya over. Even so, Lynera finds it difficult to communicate with Bronya about her feelings, choosing to keep it a secret from everyone. While Lynera is aware that her fixation on Bronya isn't healthy by any means, she stubbornly refuses to move on and insists on depending solely on Bronya for all her emotional needs. Lynera also mentions that watching Elwurd mistreat Bronya was excruciating to watch, adding that she would viciously attack the cerulean the next time she dared set foot in the brooding caverns.

I'd imagine her sounding like Topaz from Steven Universe.