In the real world, djinni are described as a race that exists in a higher state of being than humans. They can see and interact with the humans' world, but the humans cannot see or interact with them unless they will it. Every person is paired with a qarīn, i.e. their assigned djinni, at birth.
In the Covenant Academy universe, while everyone has a qarīn, a contract is not formed until the qarīn decides to reveal itself to its human counterpart, this is a rare occurrence especially when compared to ages past when, while still uncommon, was several times more common than today. The qarīn seem to prefer to reveal themselves to performers, stage magicians in today's time; e.g. Criss Angel levitates because his qarīn is lifting him up.
Djinn also possess an animal form in contrast to their human form, typically a djinni needs to be in their animal form before they can fuse with their contractor. It seems that the djinni can only hide from non-contractors. Djinni are particularly useful in that they can interact with the human world even while unsummoned, for this reason the Contractor's powers do not weaken when their qarīn is defeated; a caster's powers are largely magical and derive themselves from recitation of the Qur'an, (e.g. during the Rwandan Genocide, neither Tutsis nor Hutus would approach Muslim neighborhoods for fear of djinn and their derived magic.)
Rin on the right, Hania on the left
•Name: Tsukino Rin
•Age: 15
•Personality: An all-around bum and generally carefree; unmotivated beyond a doubt, save when food's involved. Often times it's up to Hania to wake her; it's been that way for as long as either of them can remember.
•Clubs: Culinary Club
•Brief Backstory: Rin's life has been generally uneventful, actually, save the fact that she's always been more in touch with her qarīn, Hania, than most people are with theirs. For as long as she can recall, she's seen, talked to, and been friends with Hania; they're practically sisters.
•Contract(s): Hania (Djinni)
Hania's Animal Form
•Name: Hania
•Type: Djinni
•Personality: Mischievous and excessively youthful, in stark contradiction to Rin. She particularly enjoys playing pranks on non-contractors, for which Rin can often take the blame.
•Powers: Due to the nature of her contract, Rin can cast magics by reciting memorized verses of the Qur'an.
Why the Qur'an? Many, many years ago, Mohammed was a great contractor whose qarīn taught him to use his magic first; he wrote all he learned in a grimoire and when he died his followers interrupted the grimoire as the word of God and made it sacred to their faith.
Presently, her memorized verses are these:
Surat An-Naĥl 16:81 "And Allah has made for you, from that which He has created, shadows and has made for you from the mountains, shelters and has made for you garments which protect you from the heat and garments which protect you from your enemy in battle. Thus does He complete His favor upon you that you might submit to Him." A general equipping spell, after reciting Rin's body is clothed in an ultra-light armour, increasing her defenses without hindering her speed, which is good because there's hardly any to begin with.
Surat Saba 34:9 "Then, do they not look at what is before them and what is behind them of the heaven and earth? If We should will, We could cause the earth to swallow them or could let fall upon them fragments from the sky. Indeed in that is a sign for every servant turning back to Allah." A collection of three meteors, no larger than two-meters width are summoned from the sky, falling onto the area around Rin.
Surat 'Āli `Imrān 3:116 "Indeed, those who disbelieve - never will their wealth or their children avail them against Allah at all, and those are the companions of the Fire; they will abide therein eternally." A ball of fire amasses as the words are recited, then at the end is released in a brilliant display away from the caster.
Surat Al-'Isrā' 17:45 "And when you recite the Qur'an, We put between you and those who do not believe in the Hereafter a concealed partition." A shield spell, capable of blocking a succession of melee attacks and absorbing a couple of magic attacks within a brief period of time; is particularly draining on Hania's part and can only be used once during any given day.
•Fusion:
Essentially, her powers are the same in all respects except are significantly improved.
An-Naĥl 16:81 - Stronger armour, more resilient
Saba 34:9 - Five meteors, stronger hits
'Āli `Imrān 3:116 - Larger ball, explosion on impact
Al-'Isrā' 17:45 - Less Draining, can be used twice
•Summon: As a djinni, Hania has the power to transverse large distances at quick speeds, she's found this power to be particularly useful when trying to get Rin to class on time. Her presence allows Rin to cast instantly at the expense of Hania's life-force.