'...I became a vegan dragon's disciple instead!'

A destructive little brat shows up in a dragon's cave offering herself as a sacrifice.

'...I became a kick-ass warrior in spite of my many missing body parts.'

A power-hungry feudal lord sacrifices his newborn son's body parts to demons in exchange for power. (reboot of the original series)

'...I became a kick-ass warrior in spite of my many missing body parts.'

A power-hungry feudal lord sacrifices his newborn son's body parts to demons in exchange for power.

'...I wound up ferrying souls to hell.'

Ai is chosen to be a harvest sacrifice as a child.

'...I became one of the most powerful demons in hell and turned those who wronged me into palace decorations.'

Since he is an orphan, Hozuki was chosen to be sacrificed as a child. The villagers pay dearly for this in the afterlife. 

'...my body was taken over by a demonic cultivator.'

A man sacrifices his soul, giving his body to a demonic cultivator to exact his revenge.

'...I merged with a traveling swamp instead.'

A young girl is forced to jump off a cliff and into a river as a sacrifice in episode 5.

'...I fell in love with the beast who was supposed to eat me.'

A young girl is chosen to be the next sacrificial meal for the Beast King.

'...I got trapped inside a painting.'

A young woman is chosen to be sacrificed to a powerful entity called The Throne of Yord.

'...I went on an adventure with a great warrior and my dog!'

A young orphan is pursued because he is suspected of being the prophesied child whose blood is required to create an eternal elixir. 

'...I wound up being raised by the undead.'

As an infant, demons placed the protagonist in the temple of a ruined city as a sacrifice hoping to break the seal on their king.

'...I became one of the many forms taken by an immortal shape-shifting being.'

A small girl is chosen to be carried up a mountain and sacrificed to appease a god in episode 2.

"...I lost my sanity and my humanity when I was forced to be a mad scientist's guinea pig."

A sickly young boy is taken to be a religious sacrifice in episode 5, but it turns out a mad scientist is using the unfortunate sacrifices in human experiments.

'...we saved the world instead!'

'Magical girl sacrifices.

Still more magical girl sacrifices.

Sequel magical girl sacrifices.

Prequel magical girl sacrifices. (you can also watch this arc in movie form)