16. What makes their stomach turn?
Several things, the most obvious being poorly processed energon, and not just for the usual reasons. When stranded they had to resort to subsisting on energon they processed themself manually for vorns, at an even lower grade than what a miner would typically be expected to ingest. They're no miner though and they could barely process it. Drinking it for that long eroded their tanks and lines to the point where they very nearly died. Now years after that ordeal they can barely keep down low grade despite having newly installed internals.
They also deal with social anxiety caused by their extended isolation. As much as they feared being alone again, the isolation also caused them to develop an intolerance to crowds that they previously did not have. They're at the point now where it doesn't bother them much but there are times when, yes, their tanks will turn at being in a populated area.
23. How does envy manifest itself in them (they take what they want, they become resentful, etc)?
Verve isn't the kind to let envy get to them that much. At their worst they'll sulk about something but for the most part they can work through feelings of envy pretty well.
38. What memory do they revisit the most often?
There are a few, the first being when they defected from the Decepticons. They don't regret it but they can't help thinking about how it could have gone better if they did or didn't do x or y thing, and will end up ruminating over it and working themself up over it.
There are also a few key moments in their relationship to Xenaut. When they first met him and later when they finally stood up to him and wouldn't be a doormat to him anymore. A big one is the time he risked his own life to save them and more importantly, came back for them and didn't leave when he could have. It was at that point that their relationship went from... not great... to one of mutual trust, so a big turning point.