CHRONOLOGY

PHASE I
[ during this time, Izuku is 13, Junko 15 ]
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She resides in the Watanabe tribal homes.
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𝐏𝐄𝐑𝐒𝐎𝐍𝐀𝐋𝐈𝐓𝐘; Extremely shy. Stammers when she speaks and cannot look people in the eye when talking, especially when conversing with a man. She won’t say much despite having a lot on her mind, and will easily be flustered.
She speaks like a nun, too polite and formal. She’s also wearing traditional tribal clothes.
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𝐐𝐔𝐈𝐑𝐊; none at the moment
PHASE II
[ Izuku 14, Junko 16 ]
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𝐄𝐕𝐄𝐍𝐓𝐒; She runs away, awakens her quirk, is attacked by her clansmen and recruited by the Ryujin Cartel.
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𝐏𝐄𝐑𝐒𝐎𝐍𝐀𝐋𝐈𝐓𝐘; Reserved and withdrawn. Usually does not meet anyone's eyes but when she does, there's a glimmer of rage and anguish in them. Does not speak unless spoken too. Very rigid, but not awkward, just cold and aloof. There's a very violent side of her starting to emerge.
She started wearing long skirts and puffy-sleeved shirts when she was living with her friends, but working for Ryujin is tough work and she basically has to wear attire like pants and shirts/vests. She wears boots with little heels.
𝐐𝐔𝐈𝐑𝐊; she can make tiny mirrors around her fingers. Like, dot sized. They have no use except for looking aesthetic.
PHASE III
[ Izuku joins UA, Junko turns 17 ]
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𝐄𝐕𝐄𝐍𝐓𝐒; She’s still working for the mafia, learns about the Villain League after the Hosu City incident and becomes interested. Shortly after toga and dabi are recruited.
𝐏𝐄𝐑𝐒𝐎𝐍𝐀𝐋𝐈𝐓𝐘; no major changes, she’s still quiet and reticent.
𝐐𝐔𝐈𝐑𝐊; she can create larger mirrors and put her hands through them. she doesn't know what's on the other side and it feels strained when she goes through.
PHASE IV
[ 18 years old]
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𝐄𝐕𝐄𝐍𝐓𝐒; Junko gets acquainted with Dabi. While she's been looking for him for quite a while, it's a pure coincidence that she comes across him and she immediately seizes the opportunity.
For the field trip villain attack: Junko is on a mission assigned by Dabi and not on the battlefield, so during Bakugo's kidnapping and all might fighting AFO, she is not present.
Later she is introduced to the Villain League.
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𝐏𝐄𝐑𝐒𝐎𝐍𝐀𝐋𝐈𝐓𝐘; slowly coming out of her shell. Talks more. Sometimes she will even laugh softly at lame jokes her co-workers tell. she's more comfortable in tighter clothes now, doesn't mind leaving a few buttons of her shirt open. talks more naturally rather than like a nun, but she still has a quiet side. she gets shy/intimidated around other villains easily, especially male members of the league (which is....almost all?) since she is still not too open around them. She is beginning to better her skill of mirroring people, basically she can shift her personality to boost her influence/positive opinion around different people.
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𝐐𝐔𝐈𝐑𝐊; She can go into the mirrors! It’s really trippy and confusing in there, so she’s trying to figure out what exactly she can do. She’s figured out somewhat of the mirror world. while in there, she found she could create illusions in the mirrors.
PHASE V
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𝐄𝐕𝐄𝐍𝐓𝐒;She is actively present ever since Chisaki first arrives at the meeting. During Eri’s arc, while Twice and Toga do their part, Junko is back at HQ, waiting for the duo to do their thing. She’s later present on the truck the Villains use to get to Chisaki.
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𝐏𝐄𝐑𝐒𝐎𝐍𝐀𝐋𝐈𝐓𝐘; excited about everything, a newborn fashionista, can be inappropriate sometimes, she laughs a lot (sometimes too loudly), she's wildly passionate for a lot of things, she has almost completely come out of her shell by the end of this stage
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𝐐𝐔𝐈𝐑𝐊; Junko can now use shard attacks. Where she sends large or small shards of glass to pierce her victims. She can fabricate about five full-sized mirrors at once, and 10 small-sized mirrors. She can stay in the mirror for 3 minutes max.
PHASE VI