just, y'know, in case any of these come in handy- 

Dearly Detested,

Notable Nemesis,

Esteemed Enemy,

Beloved Bête Noire,

Revered Ruination,

Favorite Foe,

Prized Plague,

Darling Disputant,

Hallowed Host of my Hatred,

Loathed Love,

Adored Archenemy,

To whom it may aggravate,

To whom I'd like to ki—