here is a pic with the liutenants and captains that were missing from the past arc (notice the 10th division is missing, that's still a secret) these characters might show up in the planned past arc with isshin in SS
Rose's Vice Captain, Iba Chikane, is Iba Tetsuzaemon's mother.
Love's Vice Captain, Kotsubaki Shin'emon, is Kotsubaki Sentaro's father.
Ginrei's Vice Captain, Kuchiki Sojun, is Kuchiki Byakuya's father.
Unohana's Vice Captain, Yamada Seinosuke, is Yamada Hanataro's father.
Yoruichi's Vice Captain, Omaeda Marenoshin, is Omaeda Marechiyo's father.
Kenpachi Kiganju is the 11th Division Captain who is killed in battle by Kenpachi Zaraki.
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and here is a really good SPOILER FREE interview with Tite Kubo
Spanish and the Names's Origin.
Q: Spanish frequently comes up but is it to contrast them from the Shinigami?
A: During the the time the Menos Grade came out, I was thinking I wanted to use a language that had a good meaning yet sounds bad/evil. If it's evil, Indian sounds evil, but I had an image of something that sounded very cool and cool-headed. Similarly, Spanish has this devil-ish, and sexy sounding and a dark* sound to it which I liked, that's why I have chosen Spanish. [*don't know the right word]
Q: Did you first decide on the names of the attacks in Japanese, or did it first occur to you in Spanish?
A: The names of the attacks in Resureccion form are mixed up. It's like vaguely deciding on an image. For Nnoitora, it was decided quickly. I had a image of a praying mantis. It was whether a snake or a praying mantis. I was tie-dyeing on both, so I looked it up in the dictionary and chose which sounded better.
Q: So you decide on an image on the character's outward appearance?
A: More than from the outward appearance, it's while thinking of the outward appearance along with the personality, and more than anything else it's whether there will be an appeal to it. And there're also some things I take from the 7 deadly sins. Like the one now, who are the espadas? Barragan, Aroniero's "Gluttoneria", Zael Apollo's "Fornicaras", and the same applies for Yammi. Those are the early days of "Espada". In the early stages of Espada, there were only 7 people. It's "Espada" with 7 swords but, it increased gradually and became the "Espada" of now. That's why there are some more of the 7 sins I haven't used. While drawing Aaroniero, he had the power "to eat" so I've got the "Gluttony" from the 7 deadly sins. But I also didn't want to just get stuck with the 7 sins. That's why there are times I don't use them on purpose and leave them be. Like for the early days Espada that survived (laugh).
Q: That's nice.
A: Maybe they were pushed aside. Maybe they disappeared/died by themselves. That kind of story.
Q: So it's like you're not limiting the names of the characters to Spanish.
A: That, I'm getting everything from designers. Designer or architect or an interior designer. Wonderweiss was from a designer named Maricel Wanders. From that I've reversed and made sort of an parody out of.
Q: Everyone? Like Jaegerjaques?
A: That one I've put on conveniently. "Jaeger" is a peculiar spelling isn't it? I've named it according to a clock named "Jaeger-LeCoultre". Originally, "Grimmjow" was from an architect named "Nicholas Grimshaw". "Grimshaw" sounded cool, so I used that. But Nicholas didn't come out nicely so (laugh). Then, I've made it into "Grimmjow" that sounds nicely and fit the spelling into it.
Q: Also Stark?
A: Stark is from "Stark" Philip Stark. There's also one for Ulquiorra. It's from a woman named "Patricia Ulquiorra".
Q: For the Real World team, "Kurosaki" and "Ishida" and the likes are familiar surnames.
A: Yes. For the Real World members, I thought to make them a common name. But as much as possible, I thought (of their names) while thinking I wanted them to make an impact. Mostly it was based on sound and the design but I thought it would be nice if the somewhere in the sound would get people hooked. Like Ichigo whose name is weird for a guy. And the "hime" in Orihime would have us asking "What/Hmm?". In Sado, the "tora" in Yasutora. Lastly, as much as possible, I wanted as many strokes in the Kanji as possible (laugh). It's a matter of design when I put the kanji together.
Q: I'll return to the story, when Ryuuken saw Isshin's Shinigami attire and said "So it came back", I was thinking that it meant they knew each other from the past. So if Isshin is a shinigami, it means that he once was in Soul Society, right?
A: That's right.
Q: In reality, Quincy and Shinigami hate each other but, they are surprisingly friends. Will that be clear in the future?
A: That part, it's still a secret (laugh).
Parts were blanked out to prevent major spoilers. Annoying, no?
Q : May I ask you about the 10th division captain from the past? (TBTP)
A : OOO isn't dead. OOO is perfectly fine in OOOOOO
Q : The so-called OOOOO, do you mean OO is OO?
A : yeap, OO is OO. At that time the candidate was the 10th division vice captain-OOO(nt: someone's name),who was originally to be promoted as captain, but...
Q : Woo, I felt there is an incredible spoilers coming up.
A : yeap, OOOO (laugh). But alot of things happened, so..eventually, OOOO,OOO hitsugaya toushiro is promoted . OO is OOOOOOO.
Q : eh? could it be at that time OOOOO is involved?
A : yeap, OOOO. If OOOOO, such OO should do. (laugh)
Q : Personally, I would have expect if OOOOO, OO will be the vice captain, but I was totally wrong (laugh)
A : That's interesting (laugh).
Q : The thing that's hanging in Syazel Apporo's lab, how is that happening?
A : ah, OOO.The drawing was OOO and OOO.
Q : (while reviewing shonen comics-ƒWƒƒƒ“ƒv.ƒRƒ~ƒbƒNƒX) ahh!!! eh--??!! Indeed!! It really is OOOO (laugh)
A : your reaction makes me feel so happy (laugh).
Q : Why thank you (laugh). From now on, are you gonna develop OOOOOO?
A : perhaps there will be no connection with OOO,but I think will be in connection with OOOO.
OOOOO.
Q : hold on a sec(laugh). Just now, do you mean OOOOOOO ?
A : (laugh)
Q : If it is OOO, then this will be the next series?
A : not the next series, its the next next series. Now OOOO is already OOOOO, its all already in OOOOO state/condition.
Q : oh(laugh)!?
A : Even in this state, OOO still maintains the original look, although OOOOOOOOOOO (laugh). If OOOOO,for OOOOO its like a OOOOO device, OOOOOO (laugh).
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Credit to czeliate on BA:
The next arc will take place in Karakura town and a character who's older than Ichigo will appear.
Kubo was asked if Chojiro could ever become a Captain, to which Kubo replied that he lacks the qualities a Captain would need. He draws characters like that, so Vice Captains like Hisagi and Kira probably don't appear to have the right stuff to become Captains either. Kubo says it'll be interesting to see if any Vice Captains get promoted to Captaincy.
Kubo was asked if Marenoshin was a member of the Omnitsukido. Kubo replied that he was and that he thinks Marenoshin is more outstanding than his son.
According to Kubo, Seinosuke isn't a nice person but he has a great respect for his Captain. On the subject of Unohana Kubo was asked how old she is, which Kubo replied that she was already a Captain from the beginning and he'll draw her "true face" in the future.
Kubo wants Ganju to re-appear in the manga.
Kubo plans to reveal all the Royal Guard.
Kubo says he'll probably pen another Turn Back the Pendulum Arc since the various Vice Captains and Kiganju have been introduced.
Kubo wishes readers didn't make judgments on characters they don't properly know yet and that he'd prefer they understood the character before they decided whether they love or hate them, which is why he made Hisagi so prominent in Fake Karakura Town.
Kubo doesn't feel as if some of the dead characters have received proper closure, so he is wondering how he will give it to them.
Lastly, Kubo doesn't hate any characters - even the really evil ones.