Celestial Mark[Placeholder]:
Zodiac: Gemini
Name [Placeholder]: Gemini (red hair) / Double (black hair)
Appearance:
Ability: Doppelganger
There is always a "double" of herself present. The doppelganger looks like a normal, individual person that could easily pass as her sister due to looking strikingly similar, but not the same. The double can not be interacted with by anything or anyone, as it is shifted out of phase. Attempted physical interaction will go right through Double and leave something reminiscent of a smoke trail for a brief moment, before Double reforms. Several different interactions between the two are possible and described under "Attack Names and Detail".

Ability element or nature: Doppelganger/Phase Shift

Attack Names and Detail:
Phase Switch
Gemini can initiate a "Switch" between the two of them at any given point in time, without indication or effort. This causes Gemini and Double to switch minds and phases. After a switch, Gemini's mind resides inside the body of Double and vice versa. The body Double's mind is inside is always phased, and the body Gemini is currently possessing is always the interactable one.

Phase Escape/Phase Rogue
Switching before an attack connects with Gemini allows her to escape harm and confuse attackers, making her appear invincible. It also allows her to strike from the current position of her illusion, setting up surprise attacks from an unexpected angle. Since there is no "cooldown" on the switch ability, she can theoretically execute split-second attacks and switch back to safety - assuming the other body is in fact safe.

Phase theft
Objects Gemini picks up/holds while she is "switching" will phase out together with the Double, allowing her to make objects completely inacessible to others, but only until the next switch or until the Double drops the object.

Weapon: Bladed Whip (Gemini)


Hand-blades (Double)


Personality:
Gemini is an overconfident, curious being that essentially looks down on others who are less "talented". She abuses her abilities shamelessly to get what she wants and has no regrets over leaving others behind. While she's technically only an average fighter and a one-trick-pony with her doppelganger/switch-trick, she considers herself undefeatable and is incredibly easy to provoke.
Since she kind of controls both bodies with the same mind, there is no difference in personality between Gemini and Double. While the phased Double generally comes across as a mute and passive shadow, only those who understand how their mind switch works will realise this. The majority of people does not see past the noisy personality of Gemini, and since both bodies.

Bio: Gemini was neither born nor made, she was summoned. She doesn't recall anything from before the summoning ritual, making it evident that she was sealed for a fairly long time. It is unclear whether she exiled herself, was imprisoned for some terrible deed or became victim to malicious magic. She herself suspects that one of the other guardians knows more about this, but has no evidence to support those claims. Her ruthless, uncaring personality certainly doesn't swing prejudice in her favor, though. It is furthermore unclear how or when Double came into existence, though unproven rumors say that she is a manifestation of Gemini's original power that was permanently and irretrievably sealed away.

Her summoning happened only few years before the chain of events that would ultimately cause the celestial guardians to fall from grace. That combined with the circumstances of her past imprisonment has led to strong suspicions that she in specific had something to do with the murder. Being the proud and egocentric personality she has always been, Gemini would rather boast about having single handedly taken out the king and his armies than to claim her innocence. And since she thinks herself invincible, she doesn't exactly go out of her way to avoid the holy knights.