What do you call someone that has veto power over all branches of government and is constitutionally immune from prosecution?

An absolute monarchy.

Or, King Mswati III if you live in Eswatini.

And, Africa’s last absolute monarchy.

Crowned at the age of 18.

Political dissent and civic and labor activism are subject to harsh punishment, with a ban on protests and a 1/40 score for political rights.

There you can be sure there are people passionate about freedom.