In this running theme, the main character of the anime takes in characters of bizarre and unknown origin. Or they take in people people who are bizarre like they have powers.

The subjects can be put into several types of genres.

fantasy based, such as wizards of another world.

Or maybe Magical creatures and fairies who want to escape from their tormentors. Or have an other worldly vacation.

And also science fiction based such as aliens who crashed down on earth and need a place to live.

Or escaped lab subjects who were experimented on and turned into weapons.

And there's the just random type.

Five Examples of the fantasy type are

-Fate/ series.

[There should be a GIF or video here. Update the app now to see it.]

-A certain magical index

-Miss Kobayashi's dragon maid

[There should be a GIF or video here. Update the app now to see it.]

-Tsugumomo

-Our home's fox deity

As for the science fiction based examples.

-Heaven's lost property

-Sekirei

[There should be a GIF or video here. Update the app now to see it.]

-Akikan!

-Elfen lied

-DearS

As for the just random ones, two examples.

- Squid Girl

- Monster musume everyday life with monster girls

[There should be a GIF or video here. Update the app now to see it.]