Hmm...
DA:O:
Sick things:
Let Jowan use Isolde as a sacrifice
Let Connor stay possessed for the Blood Mage spec
Let Uldred possess the mages
Convinced Zerlinda to leave her kid in the Deep Roads
Defiled the Ashes and without Leliana in party resulting in her leaving
Deciding to kill Zathrian's clan with Zevran in party
Letting Caladrius go with the elves
Let Avernus preform his research without restrictions
Let Sophia Dryden wander the world
Not really in-game, but I wrote a in-depth scene of one of my Tabris Wardens killing Vaughan and his cronies. No regrets 
Filthy things:
All the "Surprise me!" results at the Pearl
3-way with my f!Cousland, Alistair, and Isabela
3-way in Aeducan origin for male
Alistair OGB
Loghain OGB
Secret desires:
Kill Habren
Romance Lanaya
Romance Ariane
Romance Sigrun
DA2:
Sick things:
Killed Fenris in all but my pro-Templar playthrough and last playthrough
Let Bethany die in the Deep Roads
Didn't let Carver die in the Deep Roads during my mage playthroughs
Purposefully got Carver to stand on one of the spinning blades traps in Legacy (the area where you find the Hawke's Key) and repeatedly activating it until he died, waited for him to get back up, rinse, repeat
Equipped Fenris with the Blade of Mercy while Rivaling him
Cheered when Anders blew up the Chantry.......... what?
Filthy things:
Romanced Merrill as a warrior m!Hawke then tried to visualize how the sex scene would play out after the F2B (visualized my m!Hawke picking her up way too easily since she'd basically be a twig compared to him)
Almost romanced Seb as a blood mage
m!Hawke/Isabela/Zevran 3-way
Secret desires:
Romance Bethany
Punch Anders
Tell Fenris to shut up about mages
Kill Petrice myself
Kill Grace in Act I
DA:I:
Sick things:
Let Sera kill that noble
Left the Chargers to die
Left Hawke in the Fade
Executed Erimond
Let Solas kill those mages
Let Florianne kill Celene and blackmailed Gaspard
Pulled a switcheroo with Blackwall and let him redeem himself
Filthy things:
None yet
Secret desires:
Slap Sera
Save both the dreadnought and the Chargers
Tell Hawke to shut up about blood magic
Give Cole a hug (it really seems like he needs one)