Pre-EXTRA!Mirai
A feisty magus with a knack for magical combat, often mistaken as a noble due to her beauty and power. Which was not helped by how tauntingly she declared herself a super-elite based on power level alone. As a result, she has had to discipline any suitors unfamiliar on the matter with a show of force with the expressed intent to raise her power level even further and loot them of any valuable thereafter. Be they jewels or servants, she will take whatever is on their person.
Of course, this constant show of force has gotten her into trouble with quite a lot of people. But she was ultimately left unsupervised to functionally do as she pleased as her ideal of world domination was deemed too small and juvenile to be a serious threat not unlike other magi her age.
After all, strength without purpose was looked down upon by most of the old-heads still kicking around, so much so the ideal they would ever need to take preventative measures to account for someone like her could or would ever show to threaten them fell on death's floor. Believing no amount of training could ever makeup for strength collected for a just cause or sinister purpose.
EXTRA!Mirai
The strongest among magi; The Black Witch. Bolstering the devastating and elusive "World-ending Sphere" as well as her signature "Draconic Revolver", accompanied by a darkened heart sometime after her father's death. She has discarded her desire for a harem and lost all interest in having servants to solely tend to a more serious pursuit for power that exceeds her current understanding and imagination. As such, even her passes at men and women alike came to a screeching halt to focus on improving her magic capabilities.
Despite this more standoffish Mirai's presence and deathly demeanor, there were still a select few that could close the emotional distance between them outside of battle to draw-out that egotistical side of Mirai's and occasionally journey alongside her.
Eventually, her abnormally high battle power led her to discovering the broader multiverse and effectively disappear for the better part of a decade after nearly tearing apart the universe. She was able to meet and witness an astounding number of mortals, monsters & celestials with power comparable to her own as she took the opportunity to continue leveling up with the expressed interest to surpass them.
GENERATIONS!Mirai
Having overexerted her very mind & soul by constantly multiplying her battle power beyond their cultivated limits via pushing the "Nth Power" to the extreme at the cost of mental fatigue and a weathered soul, her eyes have taken most of the backlash. Those sharp eyes have had their vision impaired and have gradually begun to degrade in quality whenever she tries to go any higher than the 3rd Power while transformed.
Due to this, she will sometimes wear specialized glasses to offset some of the blindness as she researches a way to either undo the damage or find alternative path to powering up. Since the ability to see is a key component to using magic and general combat.
Unlike other known variants of Mirai, this version of Mirai does have a daughter named Elaine she dropped by an orphanage for reasons undisclosed. The orphanage was never informed who could have contributed to Elaine's birth, but around this time period Mirai was recognized as something more of an assassin or a merc than a witch.
There are a lot of questions that will go unanswered surrounding this version of Mirai, but her direct counterparts have occupations ranging from arithmetic teacher, swimming instructor, author and time patrol.
MODERN!Mirai
The mainline Mirai whose experiences are comparable to Pre-EXTRA & EXTRA Mirai, except she powered up "the correct way" and significantly earlier in life compared to GENERATIONS!Mirai thanks to extended guidance from her universe's Overseer after an impossibly strong threat to all continuities showed its face and the subsequent uptick in rivals as she was obliged to go on an adventure across them to find and later piece together the Limpid Prism.
The Limpid Prism being a wish actualizing/manipulating jewel with boundless potential inaccessible to the gods by design. A delicate item only meant for mortal hands.
Although Mirai never got the chance to make direct use of the prism-herself, the year spent fighting and exploring alongside some of the Spiritual Universe's best warriors and brighter demeanors reminded her of select figures back in the Magical Universe. But not with the explicit desire to reconnect with anyone specific, but to take a rest and refamiliarize herself with the world that was without her since her memories were starting to become hazy.
Granted, she was disappointed to see how much weaker and/or stagnant most of society became when it came to magic but did not get much of a chance to fully understand why due to an abrupt awakening of spider-like stigmata said to make those tatted by them immortal. Opposed to finding time to rest, she was now enlisted to fulfill the role of a detective by the Guild-master as these stigmata have also appeared on the deceased and even repaired the bodies of those that were not preserved, effectively reviving them. Her father included.
While a bit surprised someone publicly deemed a trashy womanizer and alcoholic was marked to be revived, his presence did slash the number potential suspects. And given how taboo immortality is on a grander scale not many in the universe would understand, Mirai has limited her suspect list to The Council & Witch Council based on the power necessary to blacklist reapers from entering specific temporal worlds. But without concrete evidence it's all speculative, leaving her with little to no choice but to play along and not be so forceful when investigating since she must register all potential foes to be numerous and unkillable in a way where destruction of the soul is irrelevant.
But on the bright side, this is the perfect opportunity to refresh her magical knowledge and reasoning skills.
DIVERGENT!Mirai
Little is currently known about her apart from the fact she's one component of the everlasting fusion warrior, DIVERGENT!Satomi. Though it can be inferred from this Satomi's naming scheme for attacks like:
"World-ending Light: Big Bang Glaive"
"World-ending Blip: Aggroed Dissection"
"Ephemeral Breath: Scattered Hellfire"
"Giga-shock Roulette: Lacerating Rotation"
It can be inferred that this Mirai has more wide-ranged and sweeping attack than highly destructive ones, since this Satomi has access to the World-ending Series just like the mainline variants but there's less of an association with more intricate piercing and cutting.
Likewise, DIVERGENT!Satomi is much more selfish compared to the standard one since she can be convinced to effectively fight mainline Suki & Mirai (and/or Satomi) on the behalf of an extradimensional threat with the promise of an incredible battle, and is labeled a villainess via her title card debut on Discord:
[Crash Course of the Ultimate Fusion!! Even Villains Dream of Paradise!!]
And seeing how mainline Mirai already possessed villainous attributes, there is a good chance DIVERGENT!Mirai is the culprit behind DIVERGENT!Satomi's existence. However, the multiverse is a strange place so there is no telling how/why things turned out without jumping through time.