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Think about who populates the universe. Is it humans and human-like being? If so, what type of humans are in the universe? You may base the humans in the universe on human groups that exist in our world or merge several groups to create the humans of your fictional universe.  For example, you may decide that there is a race of humans that were colonized by another race to create a hybrid race. You may use elements of American slavery and the colonization of indigenous peoples in Canada as templates for the human groups in your universe. If you do use existing human groups as a template for the people in your universe, make sure they are multi-dimensional and not based solely on stereotypes. You are creating a fictional universe, after all, so you can add in nuances and oddities as you see fit, even to the humans who inhabit the universe. Your universe may also have otherworldly beings or creatures, such as elves, dwarves, and fairies. You may have otherworldly creatures who live among humans or a universe populated by only creatures and no humans. You can also make up your own species, where there are magical elements and human elements present in the beings in your universe. Let your creativity run wild and create a species that will be unique and engaging. You may also want to account for the role of certain objects in the universe and their role. These could be objects that are used by every being in the universe or objects that are only used by a select few. Start by focusing on objects that have an important role in the universe and then move down to less important objects that are used in the more mundane aspects of the universe. For example, maybe the universe is held together by a central object, such as a shard of dragon’s glass or a molten ball of gold. Or, maybe the universe is populated by special objects that grow on trees or on the graves of the dead. Use your imagination to sketch out several key objects in the universe to make it feel more detailed and well-rounded. Though not every fictional universe needs to contain magical elements, your universe may benefit from a little magic. If you are going to include magic in the universe, you should determine how much magic exists and who can access this magic. You should also consider the origins of the magic, such as nature, ancient artifacts, the gods or a God, or powerful humans.  You should also think about how the magic is treated in the universe. If the magic is powerful, are there keepers or guardians of the magic? If the magic only available to a select few or has it been forgotten and waiting to be reclaimed by a chosen hero? You may also consider if the magic in the universe is considered a positive element, like a sacred gift or treasure. Or, maybe the magic has negative connotations, associated with fear and evil.
Determine if the universe is populated with humans or human-like beings. Include otherworldly beings or creatures. Consider if certain objects have value or meaning. Address the role of magic.