Who are the three servants in black butler?

In the manga and anime series Black Butler, the three servants working for the Phantomhive household under Sebastian Michaelis are:

Bardroy Austin: The chef of the Phantomhive Estate with a military background.

May Linn: The housekeeper and nanny responsible for overseeing household administration.

Finnian: The clumsy yet hard-working gardener of the Estate.