Recently at Anime Iowa during the RightStuf Panel, one of the hosts mentioned that you are looking into what defunct titles fans are interested in seeing finished for manga. I have a list here for you, hopefully someone takes note! From Tokyopop:
Gakuen Alice- I know that Nozomi licensed and has the anime, so I'm hoping perhaps the manga may get picked up as well. It stopped at #16 here, and is ongoing in Japan at 27 volumes. I know longer series are sometimes a risk. Is that why it hasn't been picked up? Even though it was on the top NY times best seller list? I absolutely love it and hope someone will reconsider, maybe you!
Good Witch of the West ( Nishi no Yoki Majo) - This was a giant build-up of love, then frustration, then disappointment. Even though it had much praise, and many fans clamoring for it's end it came so close and still fell. After a hiatus of more than a few years Tokyopop was going to publish the 7th and final volume, thanks to the continuous requests to have it finished, and a wonderful Tokyopop intern that listened. Then Tokyopop closed two months before it's release date XD So this is probably one of my top wanted. Please please please consider printing the final volume on demand. (Also a hint, it has novels and an anime too though I haven't seen it (and it looked like it was changed quite a bit) Released in 2006! That might be nice! :D)
Happy Cafe- This one got to 8 volumes, and had 15. Another that may be a long shot since it still had 7 left but worth listing! So cute!
Kilala Princess- Now this is probably a snowball chance. I know I may never finish it, however I did love the art quite a bit. The first two volumes got released as 4 mini manga's way back, when it had a total of 5 volumes. It is a kodansha title, with disney involved so I doubt it will ever be re-released/finished.
Love Attack- Had 6 volumes printed, with 13 ongoing in Japan. However another Kodansha title dropped in the middle from Tokyopop. Also slim chance, but it never hurts to ask.
Pantheon High- Volume 3 was finished by it's american creator, and even released digitally but never actually published. (It also was online for a limited time and I missed it T_T) however, I would really like to own a physical copy of the final volume.
Princess Ai: Prism of Midnight Dawn - Since it was made via many creators, I don't know quite how this one would work but I would like to find out the end!
Queen's Knight- 12 of sixteen published volumes, I would love to know how it ends after investing so much into it!
The Third - I would like to continue with this one, and since you have the anime I thought it couldn't hurt mentioning it!
V.B. Rose- This was another that came so close. With 12 volumes published, with only 14 total. The 13th volume was supposed to be released two months from whenTokyopop closed it's doors. T____T So this is a plea to get the final two volumes picked up and finished!
That's it for Tokyopop.
The only title from Go! Comi that I had wanted finished:
Bound Beauty- It had three volumes of 8 published. I really enjoyed previous series by Mick Takeuchi and I would love to finish the rest!
The only title from Viz (and the only one from nostalgia childhood) Also enter a snowman into the 4th level of ___ :
Magical Pokemon Adventure
Since they publish everything else pokemon still, I doubt there is much chance for a reprint or finishing things off, but all the older volumes go for so much now even used! They printed 7 of 10. This is one I would want to share with a daughter someday, but even the used copies go for $50 or more sometimes.
Stolen Hearts (Toraware Gokko) - Such a wonderful light series! It got two volumes of the four released, and I would really really like it to be finished. It's always bad to be left in the middle.
Venus Capriccio- CMX closed with a single volume to go, with about a month or so to it's print date. Another that was sad as well as frustrating! I really want to own the last one!
Venus in Love- 8 volumes of the 12 were printed. Another series I just adore, and I would like to own the rest of!
Young Magician- I followed this series eagerly from the beginning, (for 6 years!) and loved the creator's other series as well. It was a blow to have the final volume canceled when CMX closed a month before it was due. I want the final volume badly, and print on demand after all the time may be my only saving grace!
So there it all is.
My top one's however would have to be the manga series's with only one volume to go or so! (I do want the others, but realistically these also have the best shot at being rescued!)
Good Witch of the West, Pantheon High 3, Stolen Hearts, V.B. Rose, Venus Capriccio, and Young Magician are my top 6 that I would rejoice for!
Also if it is helpful to whoever reads this and takes note: What Manga You Want Continued, Tokyopop
A intern at Tokyopop started this quite a few years back and people still do post on it occasionally. It's what got the ball rolling to finish Good Witch of the West before the whole shebang crumbled. There are a lot of uniformed posts about the state of the series that they ask for (like asking for more of a series that is already done or still on hiatus in Japan), but a lot are legit, sincere requests.
Thank you for taking the time to read my ridiculous long post, and I hope it helps!