Some butt animations are shown. Not often though.

Nothing explicit is shown or talked about, but there might be some innuendos that kids won't understand.

Some kissing and hugging.

Throughout the series, Spike the Dragon has a huge crush on Rarity.

Several season premier and finale episodes include scenes of characters engaging in fights with villains. There is no on-screen blood, but characters do still punch, kick, and throw each other, as well as shoot magical energy beams at each other in a cartoony manner.

in the episode ¨magic duel¨ a unicorn whips two ponies with a whip. in that same episode; there is also an allusion to ¨writhing in agony¨.

In one episode, Twilight Sparkle can be seen with a pink cut on one side of her face.

Lots and lots of slapstick violence, including things such as anvils/pianos falling on ponies.

A monster chokes to death. This is done in a comedic style, but it is still dark.

A few mild references

In one episode, Fluttershy (who is angry at Rarity and Pinkie Pie) says that she doesn't give a 'flying feather', a euphemism for 'a flying f**k.'

Characters sometimes say "heck." Other times, they'll exclaim things like "what the hay" or "what in tarnation."

Characters may use placeholder swears like "For the love of Equestria!" or "Oh Celestia!"

In "Owl's Well That Ends Well", one of the characters, a baby dragon named Spike, falls into a bowel of punch. Pinkie Pie then comments that the punch bowl has been "Spiked".

There are a large number of monsters/villains. Nightmare Moon, Discord, Queen Chrysalis, King Sombra, the Chimera, Tirek, Starlight Glimmer, the Pony of Shadows, Cozy Glow, and Grogar are some of the more intense ones.

Some characters have mental or emotional breakdowns; they are never violent, just intense.

There are some emotional and sad scenes that very young or sensitive kids may find intense.

In "Castle Mane-ia", the cast spend most of the night in a derelict castle the environment is very spooky with the characters becoming increasingly frightened, there is also a shadowy figure playing an organ which results in various booby traps triggering, although this only turns out to be Pinkie Pie.

Despite some darker moments, overall, it is a very light and happy show that attempts to teach children to be nice and accepting of others.