After Eren Yeager's death and the end of the Titan era, the Founding Titan's power effectively ceases to exist in the world, though the source (Hallucigenia) remains, hinting at a potential return, as Ymir Fritz chose to disable its activation, ending its lineage, but leaving a potential for a new era tied to the tree where she first gained power.
So why did Ymir wait for Mikasa? She waited for Mikasa because just like herself, Mikasa is a slave and or drunk on love. That is what drives her and it is the core of her character. She is compassionate, loyal and of course infinitely deep in love with Eren.
Grisha entrusted Kruger's mission to Eren, leading him into the woods alone and injecting him with a Titan serum. Eren would have no memory of the event for the next five years, and as a Pure Titan, he consumed his father, inheriting both the Attack Titan and the Founding Titan.
Zeke was the son of Grisha Yeager and Dina Fritz, the older half-brother of Eren Yeager, and a member of the royal family from his mother's side.
The Hallucigenia (the source of all Titan powers) isn't even dead — it crawls out of Eren's head after the final fight, still alive. The foundation for the Titan system is still very much in place. The only thing that's changed is that Ymir chose to disable it.
In the end of the anime,we can see that mikasa buried with White lilies, In japanese culture White lilies symbolized that purity, Virginity and rebirth. She never once gave any guy attention or a hint of affection other than Eren. If we just look at the manga, it's crystal clear that Mikasa never got married.
After the end of the manga, we learnt that Eren killed 80% of humanity and the 20% of it mostly lived in Paradise Island. What was believed to be a lie at the start, turned out to be a reality in the end.
However, despite knowing the eventual future awaiting the world, and his terror at the vision of Eren enacting the Rumbling, Grisha still decided to give the Attack and Founding Titan to Eren after learning about the death of his second wife Carla, reigniting his hatred for Marley and desire for her to be avenged.
Eren does not have royal blood. To have it you'd have to be descended from the Eldian royal family. Zeke has it through his mother Dina and Historia through the Reiss family.
Eren's true love, widely considered by fans and supported by the creator, is Mikasa Ackerman, though their relationship is portrayed as tragic and complex, evolving from a sibling-like bond to deep, albeit complicated, romantic love that he struggles to acknowledge due to his grand, world-altering plans. He confesses his feelings in the end, but it's within a tragic context, acknowledging he couldn't bear seeing her with anyone else and seeing a future where they lived happily in an alternate reality.
While it has not been performed by every Titan that has been shown, it is noted in the series that all Titans can harden with enough practice and training. Hardened materials on Titans were shown to be penetrated by Thunder Spears, sheer strength (presumably by another Titan), or the power of the Founding Titan.
Immunity to the Founding Titan
The Ackermans are former Subjects of Ymir and could manifest within Paths; however, they were immune to the Founding Titan's ability to alter memories. This led Kenny's grandfather to speculate that they were not Subjects of Ymir as the majority race within the Walls were affected.
The Cart Titan is in no way a weak link, but it can be considered the weakest of the Nine. Held by Pieck Finger for the run of the show, the Cart isn't built for direct combat or known for its overpowering strength.
The Simple Reason as to Why Mikasa Kissed Eren's Head. In the end, the message is clear. Mikasa kissed Eren because she loved him, and she never stopped doing so. Her affection transcended the chaos of wars and the formidable powers of Titans.
Under his command, she also vanquished the armies of Eldia's rival, Marley. To "reward" Ymir for her service, Fritz took her as his concubine and together, they had three children: Maria, Rose, and Sheena.
Soon enough, Eren proceeds to continue his mission. The sight of him carrying the boulder gives the Garrison elite soldiers hope, so they plan to continue defending him to ensure humanity's victory. After Mitabi and Ian meet their deaths, Eren succeeds in plugging the breach in Wall Rose.
Jaeger (イェーガー Yēgā?) was the father of Fay and Grisha Jaeger, and the grandfather of Zeke Jaeger and Eren Jaeger. He was also the guardian of Zeke after his son was arrested by the authorities.
Zeke Yeager (ジーク・イェーガー Jīku Yēgā?) was a former Global Defense Force Captain, responsible for overseeing military strategies. He is the son of Grisha Yeager and Dina Yeager, an Eren Yeager's half-brother from their father's side, as well as the user of the Armored Titan.
Fritz (フリッツ Furittsu?) is the former king of the Walls; however, he was a puppet king who acted as a substitute for Rod Reiss, the real king at the time. After the coup d'état and Rod's death, he was replaced by the real ruler of the Walls, Historia Reiss. He is unrelated to the real Fritz family.
Grisha believed in his son's ability so sincerely that he allowed himself to be devoured, believing that Eren would one day use the powers from the Founding Titan to control the Titans outside of the walls to fight back against Marley.
Eren wasn't of royal blood, but since he touched someone who was in the moment of the transformation, he was able to completely transform.
In season two, Eren Yeager and Armin Arlert, among other Survey Corps members, began growing suspicious of two of their comrades, Reiner Braun and Bertholdt Hoover. Reiner and Bertholdt eventually confessed the truth to Eren, admitting they were not just Marleyans undercover, but Titan shifters too.
Eren possessed the power of three Titans. From his father, Eren inherited the Attack and Founding Titans. After eating Lara Tybur during the Raid on Liberio, he gained the War Hammer Titan as well.
Approximately 80% of all human life on the planet was ended by the time the Rumbling was stopped prematurely by the combined efforts of the remnants of Paradis Island's Survey Corps and Marley's Warrior Unit.