Royal guards

There isn't alot about princess celestia's guards.

In "A bird in the hoof" Rainbow dash tries to make them laugh and asks "what do I have to do to be the princesse's royal guards".

Later on that episode they enter Fluttershy's house asking for princess Celestia's pet phoenix.

Rainbowdash then tells the phoenix to tickle the guards and they start laughing.

The guards also appeared in the intro but that time they were grey.

In episode1 they were carrying Twighlight and Spike to ponyville.