Has your party rogue ever sealed themselves in with the BBEG when they realized they were leading the party into a TPK trap, sacrificing themselves so that their party could live to fight another day? Has the Paladin ever learned that their Paramour was working with the BBEG, and had to grapple with the conflict between love and The Quest in a way they never thought they would? Anyone ever had a character be the love, child, parent, sibling, or childhood best friend of the BBEG?
Hell, anyone has inter-party romance in their games?
Yes. But not as a rogue or a paladin.
Warning, long winded tale ahead.
Along time ago (about 1988 - on through early 90's) in 1e I played a human ranger.
Over the course of many adventures the party ran into an mostly neutral/evil & often hostile rival adventuring party on numerous occasions. They were a comparable match for us. This rival groups origin? Just a throw away random encounter rolled up on the charts in the DMG & then randomly generating the NPCs. Took considerable time during that session....
So, not wanting to waste all that effort, or cause a TPK on the players side, whenever the groups would meet if it turned violent neither players nor DM went full out trying to kill off the other side. Casualties & even limited fatalities yes, but no TPK either way. Though over time the rivals turned out to have a core group with several revolving Red Shirts.
Eventually each of the core rivals were nearly as detailed character wise as any of the PCs. And occasionally we'd run into members of their core outside the dungeons. (the DM rolled randomly - Go to Dungeon? Roll to see if they show up. Go to town? Roll. Traveling between places/stop at inn? Roll.) So RP without the swords/spells began. This eventually led to my Ranger & the rival Wood Elf Thief having an on/off affair - known by the players, unknown by our respective teams. The Human Ranger: LG. The W.Elf Thief: NE
In a dungeon, if we met while "working"? Violence. But outside "work"..... hmmm, not so much.
Then there was a looong stretch when we were around 7th - 10th lv (wich in 1e = considerable play time!) where the rivals weren't seen at all (the dice were rolled right there at the table). And in that time my ranger married a local noble woman.
Shortly after that the Wood Elf turned up at my door with a 1/2 infant she claimed was mine & a tale of an actual BBEG who was planning an usually dire Realms shaking event. The rival party - though themselves evil - needed our help to stop this. So the 1/2elf infant was left in the care of my characters new wife & 9 characters all in the 9-11 lv range set off to save the day. This was the only time the DM didn't roll concerning the rivals showing up btw.
In the end? We blew up a volcano on us all. And by "we" I mean our own PC cleric blew it up. Wich was not the outcome the DM had forseen.... He'd simply crafted a good high lv, challenging dungeon/adventure vs a lich, but he wasn't
aiming for a TPK.
And neither was the Clerics player. When he set the destruction in motion he thought that surely the DM had anticipated such a possibility & probably had some idea for an escape.
Response to that thought was along the lines of "Um, no......"
Thus PCs, NPC rivals, BBEG & hoard, and the BBEGs master plan - all tragically killed under a mountains worth of lava & tons of rock.
Realms saved.
Flash forward to Jan. of 2015.
The group I was playing with at the time decides to run 5e. Hoard of the Dragon Queen to be exact.
I roll up a 1/2elf Ranger with the Noble background.
He's the adopted son of a northern Noble family who's adventurer parents were killed saving the Realm when he was a baby.
He's been traveling down south trying to reconnect with his wood elf mother clan & is making his way home, back up the Sword Coast when he comes across the small town of Greenest being attacked by a blue dragon & cultists....
Being the son of renown heroes he can't
not get involved.

We play about 1/2(?) this book before we decide that this AP just sucks & start a different homebrew campaign. Within a year this group breaks up.
Flash forward to the fall of 2017.
Another group I'm in decides to play SKT. I roll up a Dwarf fighter (intending on BM).
- Unfortunately he dies defending the cloud giant tower from giant buzzard riders.
+ But I just happen to have a certain Nobel 1/2elf ranger's sheet still in the folder who's only one lv higher!
Thus the party meets him in Goldenfield. After having played his small part in thwarting Tiamat his northern trek has led him here. Along the way he's heard talk of increasingly hostile encounters with giants.
He's gotten here just in time to help defend it against an goblin/ogre/Hill Giant attack.
From there we play through the rest of SKT.
And in a humorous twist?
While saving the North from giants & dragons he found time to have an affair with a FM High Elf Cleric - a fellow adventurer played by one of the gals in the group. Who, at that time, had no idea about his fathers affair with an elf 25 RL years ago.....
So at the end of SKT they were heading home to introduce her to his adoptive parents.
No idea if there's a child involved - yet.