“Ingenuous” should remind you of a genuine person who is upright and unsuspecting. He/she neither suspects nor resorts to chicanery.
Challenge authority & status quo.
“Anathema” should remind you of anti-nationals who are vehemently disliked by their own countrymen. Remember thus!
“Exuberant” should remind you of the moments when you feel super – full of energy, life and laughter! Alternatively, think about super ants which are always full of energy to work for their colony, running hither and dither.
“Plenipotentiary” can be expanded as “Plenty Potential” which someone who has full power can easily claim to have!
“Minacious” should be very easy to remember as it sounds very close to its meaning “Menacing”.