This page talks about Reika's summomings and what they look like.

Name: Yami

Gender: Male

Looks:

Personality: Obedient, Loyal, Loves flying, Enjoys fish, and loves sleeping on top of clouds.

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Name: Konton

Gender: Male

Looks:

Personality: Loyal, Obedient, Sometimes lazy, sometimes clumsy, Likes sleeping, Has a tendency of staring at people for no reason, and loves to light things on fire.

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Name: Hakai

Gender: Female

Looks:

Personality: Obedient, Quiet, Loyal, Kind, Loves Water, Tends to get into fights with the other summonings (mostly Konton), Willing to help her master or any human if necessary.

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Name: Zanji

Gender: Male:

Looks:

Personality: Obedient, Loyal, Hates humans, Loves cats, Enjoys Reika's company, Likes napping, Hates being disturbed when he's in the middle of a job, Hates the rain, Loves fire. 

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Any other information about the summonings: All of them were once affiliated with Reika's brother. But once he died, they all started following Reika's orders.