Sticking with the superhero theme....
This is actually part of a reboot/retcon of a previous Superman related project I was working on a few years ago brought on after watching a few episodes of Young Justice the other day. Used to be a huge Superman fan back in the day and still am to an extent, though I'm not to fussy over the New 52 version of him, I must say. I dunno, call me a purist. Anyway, the characters above and the story behind them don't necessarily fit into a particular Superman multiverse realm- they probably work best in the Young Justice animated continuum however (Earth 16).
From left to right the girls are Himiko, Rinko and Aiko Shinsuke; 5-year-old clones developed as part of a continuation of the Cadmus project that created Superboy. Much like Conner/Kon-El, the girls were developed from Kryptonian DNA spliced with Human DNA- the human donor this time around being Kazuya Shinsuke, a former Cadmus project leader who'd worked on the Superboy clone and now the head of the Shinsuke Zaibatsu, the ones responsible for the girls' creation.
The three girls underwent growth acceleration and had false memories implanted within them, making them believe as though they were born and raised in a natural setting, and are in fact teenagers and that their powers are the result of 'meta-human mutation'. After their 'birth', Kazuya Shinsuke took it upon himself to supervise their development and took them as his daughters since they were after all created from his genes.
The girls share a common power set, including super strength, flight, super speed and injury resistance. Each also has their own 'unique' abilities that were developed as a result of the human factor of their genome.
Rinko, aka 'Seraph', is the eldest (by a few minutes) and the de-facto leader. The most balanced of the three, she possesses the ability to fire kinetic power bolts from her body as well as form a deflective shield around herself and others in her proximity.
Himiko, aka 'Succubus' is the 'fighter' of the group. Being the middle child, she's also the more rebellious of the three and often butts heads with Rinko over leadership of the group, and occasionally bullies Aiko who is the youngest and also smartest of the group. She possessing a purely offensive unique power set that includes the ability to project explosive energy blasts from her eyes and hands as well as the ability to drain sources of their energy, including other people, and increase her own as a result. The more energy she absorbs, the more destructive her powers become.
Aiko aka 'Spirit', is the youngest of the three (though born only minutes apart, due to the growth acceleration, she is actually a full year physically removed from her sisters). She is the smartest of the group, possessing a highly analytical mind. Although not a pacifist, she would much rather negotiate her way out of a fight than get drawn into one. Her unique powers are supportive in their nature and include ice projection which she can use to create barriers or freeze things in their tracks, and telekinesis which enables her to move things purely with her mind.
As part of their conditioning and memory implantation, the girls were each implanted with a mental barrier that made it so they could not access their powers while 'out of costume'. The girls would each be provided with a device known as an 'auto suit', that came in the shape of a small 'S-Shield'. When pressed upon their chest, the shield would stick to their bodies, expand and form a suit of their choice onto their bodies through a system of nanite replication. Only with their suits active would their mental barrier enable the girls to utilize their gifts. This was done as a means of control, as Kazuya has the ability to 'deactivate' the auto-suits remotely should the girls ever become unstable.
(I claim no ownership over Superman and any concept related to that character. All the original stuff though is mine.)
Superman and the 'S-Shield' are copyright © DC Comics