After replaying the comlink missions and Vanguard Hall of Heroes (for lulz), I still imagine Feron's voice as a deep, monotone calm-like tone when he speaks (considering he's been serving for a long time. Probably in the early days of the Order's founding), and Vaelyn as a calm, monotone woman-like tone, and since she's a lieutenant, I bet she's also been serving a long time as well.
But my real question is, how old are the NPC knights? Feron, Barrus, Rhendon, Bosco, Vaelyn, Kora, Hahn, etc. They all look to have been serving for a long time. A GM reply would be nice.
Here are my perdictions, from the fanfict of my timeline that is.
The Skylark travelled for about 12 years in the universe and OCH taken place 2 years after the crash landing. These NPC's age in my fanfic directly relates back to real life human's age, where the aging rules apply
born before the second Isorian civil war, the war that forced spiral knights to abandon Isora.
Feron: 45 1st lieutenant
Desna: 42 2nd lieutenant
Armero: 65 2nd lieutenant (NCO)
Ozlo: 57 Senior captain
Born during Isorian civil war
Kora: 31 petty officer
Hahn: 29 non ranked, junior bio reseach scientist
Bechamel: 28 non ranked, fashion administrator
Vaelyn: 35 1st lieutenant
Born on Skylark:
Rhendon: 19 corporal 1st class
Barrus: 21 lieutenant 2nd class (NCO)
Midnight: 16 valkyrie adept 2nd class (lol)