Crona has an androgynous appearance, with a thin body, monotone expression, pink hair, and tall stature. His/Her hair is quite short, with several long, large clumps sticking out in several places. The bangs are straight-cut and end above the eyebrows, but do not stay very uniform. Two long pieces of hair extend from the bangs and hang low over Crona's face.
Most of the time, Crona wears a long black old-style robe that is tight-fitting and ends at the mid-calf level on his/her legs. The robe is completed with large white cuff-links at the ends of each sleeve and a tall white button-up collar at the neck. Black slipper-like shoes with a tall white cuff protruding out of the top are also worn. For formal occasions, Crona wears a white suit: the suit is very plain, with long, un-detailed pants and a coat with long sleeves and a collar. The coat appears to fasten at the front and back.
As a child, Crona wore a black knee-high dress. The dress has a rugged cut-out at the bottom, laced with several white diamonds. Like the present-day clothing, the childhood design also has a white collar and cuffs. The shoes stay relatively the same, as well. Crona's hair is shorter and simpler in this stage, but overall the same design.Crona's blood has been entirely replaced with 'Black Blood' which both protects Crona from physical harm and provides a degree of healing. Ragnarok, originally a normal weapon, was melted into the black blood before the transfusion, which causes their symbiotic nature. This also allows them to do attacks using the Black Blood exclusive to them. Since Medusa is Crona's mother, there may be potential for him/her to be able to use magic, but nothing has been observed as of yet. In the anime, despite having no onscreen training, Crona successfully pulls off a Chain Resonance with Maka and Marie. Later in the manga version Crona dons two new appendages each armed with a different blade. It is interesting to note that, even if Ragnarok is fully part of Crona's body by being melted in his/her blood; they can separate, but only in the weapon/meister combination. The Bloody attacks put aside, it appears in Chapter 13 that Crona is able to throw the Demon Sword to an enemy (in this case, the Flying Dutchman). After killing Medusa (and possibly, eating her soul), Crona gained the strange ability to manifest his/her shadow or generate black blood from his/her feet in a strange, spiky vines appearance, being fast enough to cut Maka's cheek without her even noticing it and resilient enough to completely block an attack from Black Star. His/Her black blood also allowed him/her to create wings for flying, which are strong enough to take him/her to the moon. After absorbing the Kishin Asura, Crona power and control over Black Blood increased tremendously, as he was shown to be able to rip a tooth from Moon itself and overpower Black Star with sheer physical force during the Battle on the Moon.
Like Maka does with Soul, all of Crona's attacks are used together with Ragnarok.
Screech Alpha: Same as the Screech Beta but launch at the enemy as a projectile with explosive results.
Screech Beta: A powerful slash in the form of a mouth.
Screech Gamma: A multi-slashing attack that releases sound waves in succession.
Screech Delta: Crona uses his/her three arms to fire numerous sound waves in all directions.
Black Dragon: A soul resonance when Ragnarok will absorb all human soul eggs and morph into a dragon-form. All of Crona's attacks are enhanced..