Trashmaster is one of my favourites.
Warlord is my favorite title.
Varies by alt, but this toon is always ‘Grunt Hellroid’ 
My favorites include The Immortal, Battlemaster, and Warbound/Warbringer. I really like the last one since it’s so rare. It’s a pretty much a “up for any fight” title. I’ve done so many battlegrounds/rateds over the years I like showing it off. Battlemaster is also pretty slick title if you ask me.
I use a different title for each alt. I ground out “of the shattered sun” on two toons and use it on one - back before I was a willing grinder. My vote.
I also like vanilla PVP titles, which I use on several toons, grunt, scout, champion Knight champion, etc.
“Gorgeous”
because I can be “Gorgeous Lights”
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slayer of stupid incompetent and disappointing minions
Always has been, too bad ins temporary
Depends on the character. My favourite combinations are:
Minnie, Minion of Mayhem
Blood Champion Anemia
Corinne, Sword of Wrynn
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The Insane, you dont put you self threw that and not use it… 
Of the Black Harvest.
One of the few things I have to be proud of.
Trashmaster, the Gullible, and the Faceless One are fun.
the Uncorrupted as a flex title
The Unrelenting and Salty are my most common.
“of the Shattered Sun”
Usually Grand Crusader or Death’s Demise. After going ultra casual for the last 3 expansions it’s one of the few things that keeps my street cred as I run around aimlessly in Zoomerville.
It’s different for all my toons…
The Insane on Warlock
Crusader on Pally tank
Master of the Ways on Brewmaster
Tamer on Hunter
The Undying on Rogue
Herald of the Titans on Warrior Tank
The Insane on Zychopath, my DK tank
The Proven Healer on Priest
Starcaller on Druid
Firelord on Mage
Conqueror on Demon Hunter
The Stormbreaker on Shaman
I’d been using The Light of Dawn since Wrath, but now I’m using The Faceless One.
Battlelord, it makes me feel important when I’m not.
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I recently got the “of the horde” title so i’m using that for a while. Other than that i usually go with “the Alliance Slayer”, wich feels really good to have acquired back in 9.0
“the Gullible”
When I can I use Slayer of Stupid , Incompetent, and Disappointing Minions.
Otherwise I use the insane.