Redsole

Her name was revealed to be “Red Sole” in Vol. 9, Chapter 35 along with Double Egg and Omega.
She appears to share the same confidence about her rank that her team does, even asking if an opposing team would be fine without the usual leader.
Based on the Almanac, she wants Omega to wear cuter clothes but hasn't gotten a chance to go shopping yet. yet...
Like the rest of X-Blood, a promotional image promoting X Rank depicts her with pure aqua blue ink.
if you ask her or double egg which one of their team is scarier, they'll definitely say Omega is.

Red Sole is a pale-skinned female inkling on Team X-Blood sporting the 'pigtails' hairstyle. She has red eyes and her ink color is aqua blue with a red gradient, but can change color at will. She wears the Squid Clip-Ons, Annaki Blue Cuff, Navy Red-Sole Wingtips, and sport shorts. she is probably the shortest out of the team, yet the fastest.

Not much is known about Red Sole's personality as she is a side character, but she is shown to be cheerful and quite menacing most of the time and she enjoys taunting other teams. She has been shown to give backhanded compliments, as in Chapter 35 she mentions that Prince is "pretty good" before Double Egg scores in a Power Clam. Despite her usual cheerful face, she drops to frustration when she finds difficulty in combating the opposing team, which can cause her to squabble with her teammates. One example is when X-Blood battled Team Gloves, where she and Double Egg were splatted together. This resulted in an argument between the two. so she's propense to get into dumb arguments.