The thing is though, outside of a few characters, no Sentai has provided completely in depth character development for every series, even the best of the best. DaiRanger is the best, but Kazu and Shouji hardly grew throughout the series. Hell, only NinjaWhite and NinjaRed had any real development, while NinjaBlack was the only one of the remaining three to even get his own story arc for two episodes. AbareBlue and Yellow did not change too much after they became rangers. In fact, Killer and Black were the only ones that really changed throughout the entire show.

Just Kazu and Shoji? The only characters I felt were any different at the end of Dairanger were Kou, Daigo and Kaku.

They definitely had the most, but Rin grew with Kou and Ryo grew because of Jin.

Character development all seems to depends on the individual though. Like, I pesonally thought Wataru grew excessively throught Kiva, and that is one of the reasons Kiva is in my top 5 favorite Rider series, but others felt he did not grow at all.

I don't hold that to be true. Character development can be subtle or it can be blatant. It's all dependent on how the character thinks, acts, and behaves at the start vs. the end of the series. Wataru in Kiva obviously underwent character development, going from sulking in the tub to actually facing his problems head on.
However, then there's the case like Gokaiger. I understand that with multiple main characters, development will be spread thin. There's cases like Marvelous and Don, who did undergo development, with Marvelous realizing that the treasure he was searching for wasn't worth removing the prior 34 Sentai from existing after watching former rangers helping with evac and Don growing a spine to save his friends, and cases like Joe and Luka, who had opportunity to develop, but for one reason or another, never did.

Well, I needed something to watch on slow days like this, and Gekiranger is now happily downloading.
Please describe in five words or less what I am getting into.

Over-Time is currently up to episode 7 of Mirai Sentai Timeranger, while GUIS started fansubbing Choudenshi Bioman and Hikari Sentai Maskman.

Everybody was kung-fu fighting.

Did they ever finish the DVD rips of Liveman and Jetman? And I guess, did they batch torrent them? Sorry if these sound like stupid questions, but I only remember gtting up to 12 of Liveman and that was as far as the batches went.

Yes, GUIS completed both Liveman and Jetman, and they're now available in batches. Just wait a bit longer if you want DVD rips.

I'm fairly sure the finished Jetman batch is all DVDrips. Liveman however is still only up to 12 for DVDrips. The original rips are completely watchable though.