Moral and ethical dilemmas. When summoning a god, there are often consequences. The summoner may have to make difficult choices about whether to follow the god's commands, which could be morally ambiguous. This adds depth to the story as the character grapples with these issues. In many novels, this leads to internal conflict within the protagonist and complex relationships with other characters.
Power and responsibility is a common theme. When a character can summon powerful beings, they have to deal with the consequences. Another theme is friendship. Often, the summoned creatures become friends or allies of the summoner. Also, discovery is common, as the characters discover new summoning techniques or the true nature of the summoned entities.
One common theme is power expansion. When Naruto's summons cross over, they often bring new powers or abilities that Naruto has to learn to control. For example, if he summons a creature from a magical world, he might gain access to magic.
Another theme is the power of the crow summon. Fanfics usually explore different aspects of this power, like how it can be enhanced or combined with other jutsus. Some also focus on the unique abilities that only the crows can bring, such as their intelligence in scouting or their ability to perform coordinated attacks.
Power - up is a common theme. The main character is often weak at the start when summoned to the new world but gradually gains power through various means like training, finding unique items or learning magic. Another theme is harem. Many of these novels have the protagonist surrounded by multiple characters of the opposite sex who develop feelings for him. Also, building a new life or kingdom in the other world is a typical theme.
Another theme might be the exploration of power. Both gods and demons usually possess great power, and the novel could delve into how they use, abuse, or are tempted by this power. For example, a demon might be tempted to use its power to cause chaos, while a god has to use power responsibly to maintain order.
Power is a common theme. The power of the god and the power of the slayer. Another is rebellion, as slaying a god is often an act of rebellion against the established order.
Power is a common theme. Demon gods usually represent great power, so the pursuit, control, and consequences of power are often explored.
Well, in this type of novel, a typical theme is the struggle against the old order. Since the protagonist is newly reincarnated as a god, they may face opposition from the existing gods or celestial beings. And then there's the theme of creation. Gods are often associated with creating things, so the story may involve the main character using their divine powers to create new worlds or species. Another possible theme is the exploration of morality. As a god, the character has to decide what is right and wrong on a much grander scale.
Power is a very common theme. The god emperor usually wields absolute power and the story often explores how that power is used, abused or challenged.
The theme of power and its corruption is also common. In many 'death god novel', the power that death gods possess can be misused. For instance, in 'Death Note', the main character's use of the Death Note to kill those he deems as evil gradually corrupts him as he starts to play God, blurring the lines between right and wrong.