Big Brother Worship: Downplayed, but she does admire and respect her brother. She also greatly admires Star.
Strong Family Resemblance: It's clear that she and Marco are siblings, and seeing an aged-up Mariposa in a dress similar to Marco's "Princess Turdina" one causes Meteora to go into a berserk rampage.
She hates the "It's not criminal to be an individual" phrase so much that Marco exploits it to find her when she gets separated from him and Mariposa in a crowd.
Mariposa tries to purposefully press hers to get her mad enough to escape the vines trapping them, but all it does is hurt her feelings.
What does make her go berserk enough to go on a mindless rampage is seeing Princess Turdina. Or rather her friend in a purple dress that makes her look exactly like Marco in a dress.
Brains and Brawn: Although Mariposa is pretty tough herself, Meteora is clearly the stronger of the two due to her monster heritage, and considers her friend the "smart one".
Brought Down to Badass: Due to destroying magic in the original series Meteora no longer has magic. She also is unable to grow in size like her father but she is still super strong and can unleash a Berserker Form when angry.
Turns out though, get her angry enough like seeing "princess Turdina" and she will become just as big and powerful as when she absorbed all the souls in Mewni.
Hoist by His Own Petard: Meteora is fully aware of her role in helping destroy magic and thus confining herself, her father and all the other monsters in a dome in Echo Creek that is shrinking and will inevitably crush them all to death. Killing all the monsters rather than saving them like destroying magic was supposed to do.
Jerk with a Heart of Gold: She is selfish, blatantly ignores rules for dangerous fun, but she cares greatly for Mariposa.
Ascended Extra: Though he was mentioned in the book of spells as the leader of the rebel monster fraction and waging war on all mewmans, Daron Nefcy herself stated that he was just created to provide more background information to Mewni and that he died long before the series. Here he’s one of the antagonists and the leader of a Septarian gang.
Spared By Adaptation: As stated above he died before the original series. However, he is a cyborg and his enhancements seem to extend to his chest so it could be a matter of being brought Back from the Dead.
Would Hurt a Child: Punches and intends to kill Meteora and throws Mari against a stone wall.
Marco Diaz
He Is All Grown Up: Marco now looks like his older self from the Neverzone, minus the scars and the leather jacket.
Sickeningly Sweethearts: With Star. Though it's unclear if they are married at this point or still dating, Marco is already thinking about having children with her.
The Dreaded: Minas army in the Neverzone swamp know him as the “Devil of Thunder”. They are terrified of him.
Star Butterfly
Cloud Cuckoo Lander: She's matured a lot but still has some silly sides, like having Marco take a time out so she can talk to Mariposa.
Screw the Rules, I Make Them!: She gives Mariposa her old electric scooter so she can make it to a concert in LA. While telling her she can ignore all the lights and stop signs.
Sickeningly Sweethearts: With Marco. Though it's unclear if they are married at this point or still dating, Marco is already thinking about having children with her.
Earn Your Happy Ending: After everything they went through in the canon series, they have been able to happily and safely raise their daughter for 15 years in Echo Creek.
Brought Down to Normal: Due to destroying magic in the original series Eclipsa no longer has magic.
So Proud of You: Both Eclipsa and Globgor express pride when Meteora rocks out on her old skeleton guitar.
Past Queens A.I.’s
Back from the Dead: Subverted. They are A.I.s created from blueprints of the past queens of Mewni's neural circuitry which was engraved on the walls of the magic sanctuary after magic was destroyed. So they technically aren’t Star and Meteora's ancestors but they have their personality and memories.
Big Damn Heroes: The Solaria A.I. saves Meteora near the end of chapter 2.
Virtual Ghost: What they basically are, A.I.s with the memories of the deceased Mewni queens. Meteora even calls the Solaria one the ghost of her.
You Are Number 6: They have code numbers that identify them. For example, the A.I. Of Solaria's code is EC-AI #28-9.
The Stump
Been There, Shaped History: It is the same stump that the first Mewman settlers gathered around to survive a harsh storm and honored every year with Stump Day. However, it reveals to Meteora and Mariposa that it actually CREATED the storm in the first place.
Face Death with Dignity: While still angered when Mariposa and Meteora set it on fire it finds satisfaction knowing that it fulfilled its “purpose” of making people work together.
Revenge: The reason that it caused the storm was revenge for the Mewni settlers cutting it down.
Well-Intentioned Extremist: It traps people to force them to work and get along with each other. Yet still has no issue killing and eating those it considers a threat.
Mina Loveberry
Big Brother Is Watching: She's set herself up as this in her Neverzone Swamp camp, with posters around the caslte with her face saying "Im Watching You".
The Ageless: Averted, Mina is clearly older in the Neverzone Swamp, although it is currently unknown how she is even still alive considering that 30 minutes in Echo Creek is 60 years in the Neverzone Swamp (and the series takes 14 years after the finale). That is, assuming she spent her entire time there and didn't alternate between locations. Though the former would explain how Meteora and Mapiposa know her as "Mina the Crazy Lady."
Then we find out that she has a piece of the old wand in her possession, which seems to have some magic in it.
Failed Attempt at Drama: When Mariposa and Meteora are brought before her she is wearing a cloak to hide her face. She attempts this by throwing it off and revealing herself to be Mina. But Mariposa and Meteora have already deduced that she's "Mina the Crazy Lady" from hearing her rants about monsters.
Fantastic Racism: She still hates monsters and "monster smoochers" having spent the last 14 years (centuries in the Neverzone swamp) raising the descendants of the similarly racist Mewmans who accompanied her into an army to take over Echo Creek and return Mewni to the old ways.
Smart Ball: She grabbed this moments before trying to take out the monsters in Echo Creek with her army of loyal Mewmans. Realizing her army was made up purely out of the spoiled and entitled former Mewman nobility instead of any knights or warriors. So instead she chose to go hide in the Neverzone swamp and raise her army of fop's children into an army that could actually fight.
Superweapon Surprise: Uses her Wand fragment to power one of the giant Mewman armor suits and attack the giant Meteora after she defeats her army.
Undying Loyalty: As we saw in canon she still considers herself loyal to Solaria's ideals, completely ignoring the fact that her ghost sided with Star and let her get trampled by the dark milhorse. In the Neverzone Swamp, her throne has lightning bolts on it, she taught her warriors to hail Solaria and was furious when Meteora claimed to use her tapestry as a dartboard.
