TheWoWDBYou can find a Stack of Letters in the Glitz & Grime Hostel containing 5 letters Eirana sent to Nixx after he returned to Undermine!
However, in the Gearkick household only Bessa, Mixie and Zanni is present alongside a Gigantic Roach on the bed. On the table with the letters from Eirana is a Half-Written Letter response. It seems like Bessa didn't enjoy the last letter coming in, which contained a lot more expressed love than the previous four.
Humanoid
Nixx Gearkick
Zeppelin Engineer
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Nixx Gearkick can be found at the edge of the camp in Flotsam Shoal talking to Eirana about airships.
By talking to them you can find out that they are rather fond of each other!
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Details
This roster comes from the current game client's data files, so it is not a complete list of every NPC in the game - older world NPCs that are no longer in the modern client are absent.
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Level and Map Tracking
The game data tunes Nixx Gearkick for level 80, The War Within content.