4) Space Jump
First Appearance: Metroid II: Return of Samus (1991)
As far as items go, the Space Jump may just be the coolest at face value. An item that lets you infinitely jump in midair? Yes please. Now you essentially have nothing standing in the way of you exploring literally every corner of whatever planet/space station you're on!
This item is usually among the very last that you find during your adventure, and in the case of Super and Fusion, guarded by a tough boss. That dang flying spider... *shudder*
And no, the Screw Attack is not the same thing as the Space Jump. Did I just accidentally spoil one of my future entries? Probably.
4) Varia suit
The varia suit is the coolest suit In my opinion. It looks awesome, plus it lets you walk through super heated areas. I used to take this for granted, but after playing super metroid redesign, and having to run through super heated areas as part of the level design........let's say the varia suit quickly shot itself up my list. That's why it's number 4.
^You watched me suffer through that run how many times?!