Angel gender and Sexuality
Angels have no real concept of gender and sexuality, but when presented with such things do choose their genders and pronouns as they feel and see fit. Angels at their core do not have a gendered language, and thus it is outside influence that gives them their concepts of gender.
If a human where to describe the culture as a whole, they are aro ace non-binary beings.
Relationship Types
Pent
A rivalry of sorts; based on respect and a strong dislike of one another
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Repent
An angel relationship that is when you dislike someone but pity them. The relationship is to help one another improve.
Link
An angel relationship that is like parent and child, though most often they are are not related by blood.
Familiar
A very close positive relationship.
Connection
A relationship with one or a few who all feel deeply connected to one another, this is rare for angels and is the easiest to be seen as actual romantic love by humans and such.
Relationships
Angelic relationships are different from standard relationships most have, and the core 5 relationships are shown in a star.
Each section can have more than 2 angels within it, for example, an individual angel can have 2 Pents, or 3 familiars. The max amount in any Angelic relationship is 5 for the individual section of the relation type.
This makes angels a Polyamorous species by nature.
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For connections an angel may live their whole life without one and be perfectly fine, healthy, and happy. No relationship is required for an angel to have, and some are happy that way.