User blog comment:Ahomeschoolingroudon/Season 5 Early Hints/@comment-25968390-20160225013214/@comment-25968390-20160225225723

The only well known Metroid characters left are SA-X, Kraid, and the bipedal version of Mother Brain. I can't believe I'm saying this, but only now am I thinking of SA-X, so I'll start from there since it seems the most relevant...

SA-X?