An interesting study, I had no idea Linda had appeared in quite so many games, in fact this is the first I'd heard of there being a followup to DD:Neon, shame it's an xbox exclusive. Speaking as a perv I must say that the redesign they gave her in DD:Neon was a massive improvement on the original Really looking forward to seeing which beatemup girls you'll feature next!
Linda is one of the more commonly returning characters, but there's still even a bunch of games she's conspicuously absent in, like DD3.
Wander of the Dragons is not exactly a followup to Neon - it was developed completely independently (by a Korean team IIRC) and was actually slated to come out a year or two before Neon. It sat in limbo for the longest time until it was suddenly released without warning earlier this year. The biggest question though isn't why it was delayed, it's why it was even released at all - it's a truly terrible game. Stiff, glitchy and borderline unplayable, it really hardly feels like a finished game. Needless to say you aren't missing out on much.
I have a few pictures in the works, hopefully you'll see something soon