Lady Itoh is Mizu's mom and her dad actually loved her.
Assuming that Fowler is accurate in what he says in the season one finale, Mizu was actually someone important for more than just being a bastard like all the kids in the sewer. We know that someone powerful was continuing to try to kill her into her adulthood, and that someone else left a one time payment to her maid to keep her safe, but was either unwilling or unable to continue to make that payment. Lady Itoh, or the Shogun himself would have the influence to continue to hunt her down, while one of the other two white men would likely have had a fair amount of money at the time due to their influence in smuggling, enough to pay off a maid to try to keep their daughter safe.
Admittedly, weak evidence, but this would fulfill several narrative functions for the next season. Mizu gets to London, and after a season succeeds in tracking down her dad. Only to be complete at a loss with how to proceed when he is hugely relieved, and loves her, and reveals that he had an affair with/forced himself on/some effed up combination of both with Lady Itoh. Maybe the Shogun even pushed for this. He maybe even used the nickname "Little Miss," later used by Fowler. Fowler probably thought he was being incredibly soft the entire time. Later, when something changed and he fled the country, Lady Itoh wanted to cover up her shame, pitting the repeated assassination attempts versus the one time payment he left behind.
Finally, this would give Mizu a reason to go back to Japan and to tie her story in with Akemi's again. The end of season one strongly sets up a conflict between Akemi and Lady Itoh, where Lady Itoh is the new power behind the new Shogun, and this would give the two a reason to interact again. Perhaps Akemi's plot might even involve uncovering this history as blackmail.
Akemi's Dad is either dead, severely wounded, or imprisoned, and will be used next season as reason to give Akemi more power.
Exactly what it says. The last we see of him he is still imprisoned in the burning capitol. Yet later, in the woods, she states he is "injured but recovering." We know that she no desperately wants power, but the wife of the second in line to the Shogunate is not the only way of doing this. Next season she will continually "relay her father's messages" when in reality she is putting her own agenda into place.
Fowler and Mizu will end up bonding over their similar experiences in life.
During the journey Mizu will question Fowler on everything he knows about the remaining white men and London in general and in the process
learns that they aren't that different. Fowler will explain how he lost his family and that after the famine he tried to make a relatively honest living. But despite all his intelligence and hard work, he was always dismissed as a barely civilized Irishman. While still hating him, Mizu will be disturbed by feeling some sympathy. Fowler will express amusement at the whole situation, being the only one on the ship who knows her secret and because she left everyone else who cared about her back in Japan;
he is the closest thing she has to a friend now.
Mizu will be responsible for another city-wide fire in London
The final episode of season one is named after a historical event, a great fire did happen in Edo on the year 1657. Nine years later, on the year 1666, another great fire happened in London. With a bit of a timeskip, it's quite possible Mizu will be responsible for that fire as well.
Mizu will get a Londoner "sidekick" who seems to fill the void left by Ringo
But they'll actually be much less nice than him and have a more selfish motivation for wanting to aid Mizu.
Mizu will have an identity crisis in London
This can happen in either two ways. The British actually treat her nicely or at least civilly, causing her to reconsider being part white "devil" as such a negative trait. Or the British discriminate against her for her Asian half instead of the other way around like she's used to.
- It will absolutely be the latter by the general populace, and inevitably be both among named characters.
Blue Eye Samurai occurs in a world where
Oda Nobunaga never rose to power
In our world in 1560,
Imagawa Yoshimoto, one of the most powerful warlords in Japan at the time, amassed an army of 25,000 men to march on Kyoto to challenge the increasingly moribund Ashikaga shogunate for control of the nation. The Imagawa army crossed from Mikawa into Owari province, which had only recently been united by Nobunaga, who was a minor warlord at the time.
In contrast to Yoshimoto, Nobunaga could only field an army of a few thousand men, and he knew that he had no hope of withstanding a siege. So Nobunaga took his small army and, in what became known as the Battle of Okehazama, launched a daring attack during a thunderstorm against the core Imagawa army that was resting, unprepared and celebrating their earlier victories, at the gorge at Dengaku-Hazama. Caught completely by surprise, Yoshimoto was killed and his leaderless and demoralized army fled, with the Imagawa clan never recovering from the debacle and Nobunaga and the Oda clan quickly rising in power and prestige as a result.
However, in the world of Blue Eye Samurai, the Oda army ended up attacking an Imagawa army that was far more cautious and better prepared. Subsequently, Nobunaga was killed, Owari was overrun by the Imagawa, and the Oda clan were swept from the pages of history. This had further effects down the line, as Kinoshita Tōkichirō - who in our world would eventually be known as Toyotomi Hideyoshi, the second unifier of Japan after Nobunaga - served Nobunaga as his sandal-bearer at this time. With the downfall of the Oda clan, it is highly likely that he would have also met a sticky end. The fall of the Oda would have also affected Matsudaira Motoyasu - who in our world eventually became known as Tokugawa Ieyasu, the third unifier of Japan and the founder of the Tokugawa shogunate. At the time of the Battle of Okehazama, he was a hostage and vassal of the Imagawa. It was the death of Yoshimoto that allowed Motoyasu to declare independence from the Imagawa clan and ally himself with Nobunaga, thereby beginning his own slow rise to power. In this alternate timeline, however, with Nobunaga dead and the Oda clan no more, Motoyasu was unable to break away from the Imagawa, and hence his rise to power wound up being stillborn. With the vastly altered political landscape that resulted from the absence of Nobunaga, Hideyoshi and Ieyasu, the Ito clan eventually rose to power after many twists and turns.
Mikio's transgression was cowardice.
Mikio claims that he didn't call the bounty hunters but that he had a "moment of cowardice" when he returns to Mizu after she kills them all alone. If he is telling the truth, it may be the very same weakness that lead to his original banishment—that in spite of his skill, he failed to act in some previous battle on his lord's behalf and his lord cut him loose as a result.
It's not Mizu's father that was white. It's her real mother that was
None of the Four White Devils is Mizu's father. Instead, a white woman was in Japan as part of a business or religious mission before it was (mostly) shut to foreigners aside from the White Devils. She was a woman with enough standing to have household staff attending her in Japan, and had a child with a Japanese man, causing scandal on both sides of the ethnic divide. Mizu's fake mother (if Fowler's word can be believed) was one of her attendants, and it was Mizu's true mother that paid her to keep Mizu safe and in hiding... until most foreigners were kicked out Japan, including her. That was when the money "dried up" (as Fowler put it), to continue keeping Mizu safe, and when Mizu's fake mother decided it was time to abandon the child and strike out on her own. This is part of why Fowler is so amused when he realizes who Mizu is, because her quest for revenge against her "potential fathers" was wrong headed from the very start.
