What I described in Orion's Hounds was a pair of rigid vanes on the back of the suit, since the gills would need to have their entire surfaces exposed to circulating, oxygenated water in order for her to breathe adequately. I admit I never really thought about the chair issue (or how the helmet-suit interface works). At the time, though, I was imagining something different from what the OaTS cover image shows, something more like the crest of the Savage Dragon in comic books, though doubled and not quite as big. I'm not really sure how it would work with the wavier gill membranes shown on the cover.
We may disagree then about what the gill membranes are like. A "rigid" vane (as per Savage Dragon) would be extraordinarily fragile, and if broken, could compromise her "breathing" severely. Kind of like breaking the feathers on a bird would compromise their flight.
I saw them as bendable and membraneous, much more like the fin of a fish. It might be painful to bend them, but they would not break, nor be a potential risk of they were grabbed.
I believe that Lavena was my initial creation, casting about to find interesting and unique variations for the bridge characters. If I recall correctly, I was inspired by "The Ambergris Element" epsiode of TAS, as well as the
Iskalonian water-breathing characters in some of Marvel's old Star Wars comics, and my love for Aquaman and his family.
My brief initial description of the character from the first crew notes (Dec 30, 2003):
"Pacifican female (ops officer)
a water-breather with “Aquaman” powers; perhaps Riker once nailed her while on shore leave at Pacifica"
By our expanded set of crew notes a few months later (April 8, 2004), we had filled it out more:
"
Ensign Aili Lavena
conn/ops officer
Pacifican female
A water-breather with “Aquaman-type” powers (minus the ability to command fishes), including great strength, speed, coordination, and endurance. Ensign Lavena possesses sharp vision (her people live in the well-lit shallows of Pacifica’s many temperate coastlines), hearing (like Earth cetaceans), and smell (like terrestrial sharks). Like Aquaman, She longs to partake of environmentally-appropriate (read: undersea) away missions, for which she is uniquely suited. She wears a special EV suit while working on the bridge, including a water-filled bubble helmet; her quarters is a specially constructed aquarium, complete with an airlock to enable her to go back and forth between her quarters and the class-M environs of the ship’s common areas. Personal complication: perhaps Riker once, um, got intimate with Lavena while on shore leave at Pacifica (during a much younger and more carefree phase of both their careers, of course)."
By the date of the first TITAN Bible (July 2, 2004), which appears to predate any input from Christopher, the description had fleshed out further:
"ENSIGN AILI LAVENA
Flight controller (Pacifican female (species sometimes referred to as “Selkies”)
A marine humanoid, Ensign Lavena possesses sharp vision, hearing, and smell. She longs to partake of environmentally-appropriate (read: undersea) away missions, for which she is uniquely suited. She wears a special hooded hydration suit while working on the bridge as alpha shift conn officer, including a close-fittiing transparent water mask. Her quarters are a specially constructed aquarium, complete with an airlock to enable her to go back and forth between her quarters and the dry class-M environs of the ship’s common areas. Personal complication: it appears that Riker was once intimate with Lavena while on shore leave at Pacifica (during a much younger and more carefree phase of both their careers, of course), during a phase of her life cycle when she was in a far more human-looking and amphibious."
At that point, we were on to the writing of Book One. On July 14, I have an email exchange between Marco, Chris, Mike, and I (the first direct input into the creation of Titan that we got from Chris, including the characters he was adding to the mix), in which the discussion of Aili's gills are brought up, with some of the same questions as above. Mike wrote: " Re Lavena's gills, I second your idea of external gill membranes running down her back. I'm visualizing an aquatic version of the slave dancer who was eated by Jabba's rancor-beast in "Return of the Jedi." And, of course, this would necessitate a special customized uniform (which would have been necessary to some extent anyway, because of her water-breathing physiology)."
When I wrote Aili's scenes, I kept the exact look of the gills a bit vague, but the picture in my mind definitely resembled more the cover to OATS than Erik Larsen's Savage Dragon. As far as I was concerned, Aili was incredibly sexy, and the membranes and their flowing ability lent a softness to her that was missing due to her not having hair. And, it harkened back to sea life dorsal fins.