For your own safety,
ZergAlts advises that you
NOT eat any of the Djinn. This could lead to serious health problems such as rapidly rising body temperature, painfully long pee sessions, spontaneous air thinning within your lungs, and that odd sensation that you've eaten dirt. Also, I want to think they sound like super high-pitched villagers from Minecraft.
Personally, I like the Venus Djinn the best.
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Djinn Elements

Venus, the element of earth. Commonly affiliated with rocks and plants, although can also be affiliated with haunting and death. Venus Adepts are known to be courageous and loving.
Examples: Issac, Felix, Matthew

Mars, the element of fire. Encompasses fire, heat, and magma. Mars Adepts are commonly strong and selfless.
Examples: Garet, Jenna, Tyrell, Sarutos, Menardi, Agatio, Karst

Jupiter, the element of wind. For some reason, this element also includes thunder and lightning. Jupiter Adepts are curious and strong in mind.
Examples: Ivan, Sheva, Karis

Mercury, the element of water. Ice also exists in the mix. Mercury Adepts are usually compassionate and logical.
Examples:
Adept_Mia, Piers

Djinn sizes tend to vary oddly. One moment, they can fit in the palm of your hand...

...Next thing you know, they're practically the size of small-to-medium dogs. O.o