More serious than cartoons
Anime videos usually have real looking characters and thus seem more serious than cartoons. Those who like animations but think that cartoons are childish might find anime interesting. Anime are cartoons for older people.
They have rich stories
Anime movies usually have complex plots, rich stories and emotionally engaging scenes. This helps people who like to watch something deeper than cartoons enjoy Anime.
More connection to characters
Because anime characters look real, people can connect & relate more to them. The experience thus becomes more indulging than that of cartoons.
Fantasy & novelty
Because anime is based on animated drawings, the door to creativity is always open. The human brain craves novelty. Anime movies can have very novel characters, scenes and objects that appeal to the brain.
Because Anime movies can seem so real, they help people escape from their own world into a new world. This healthy escapism releases stress and helps people cope with their problems.
Proud to be different
People who watch anime are proud to be a part of a group that likes something that not all people fully understand. The need for belonging plus the desire to be different or even to rebel against norms motivate some people to watch anime.
Wide range of characters
Anime videos have a very wide range of characters. This helps anime lovers find characters that represent them easily. Usually, when a person finds a character that resembles him he gets attached. (See 20 Best Anime Characters)
Anime is sometimes strange, unpredictable and unexpected. Generally, when people expect what might happen next they feel bored, but when they watch something full of unexpected twists they get excited.
The same anime movie can feature fantasy, comedy, sci-fi, action, adventure and romance. Because the movies contain a lot of variety, some people find them very exciting. (See Why is Grendizer popular in the middle east?)
Emotional connection to characters
People can get very emotionally connected to Anime characters especially when the plot promotes intense emotional changes. This can make Anime seem very real to some people.
Why Do People Love Anime?
Why do some people like anime and manga so much? Why Do People Like Anime?