GoseiKnight's literally falling out of the sky at the end of one episode.
Byoutiful.

Ughh that's a tough one, especially when you get into the whole "Who Actually Counts as a Sixth/Ranger" thing. Going on a pure sixth and ranger basis, I'd probably say that my favorite is Shurikenger for just how out of nowhere it sort of comes and the whole mystery/cameo plots that follow.

Time Fire. That debut battle... so awesome. Especially the tick-tock sound effect. :rock:

What if a military sentai use drone-like weapons ?

is turboranger any good?

It was alright last time I saw it, has its moments. Nothing exceptional like Jetman just as a heads-up. The standout points of it are that they are pretty much the Marvel's New Warriors of Super Sentai them being the first teenage team and the opening theme is one of the best from 80s sentai. It is a 1989 show so keep that in mind that it can feel dated.

People like it or hate it. I seen people felt like that Turboranger was when Super Sentai was going downhill in the 90's while others seem to love the wacky humor for it.

It is good show in my opinion. Turboranger is one of my first Tokusatsu show I ever watched along with Flashman, Liveman, and Jiban. I mostly love this show because the actions, characters, and the Rangers are teenager. In my opinion, Turboranger was same good as Gingaman.

Could we have a sea/aquatic-sentai someday we they have budget ?

Unlikely. Even ignoring the budget, there are a lot of complications that come with filming something that involves a lot of water. Safety issues probably being the biggest one.