I just realized, Kana is stuck in my Fortress. He is no longer available to add him to my group (I lack his avatar). He is just standing outside my Keep. I can speak to him but I find no way to bring him back to my group.
Please help.

I have the last one.2.0.1 (with the expansion pack)

Well, i'm afraid i can't help you much as i don't have the game yet although I'm informed of the many bugs that exist as l took some time to read about them in the official forum.

If i were you, i would do a fresh install of the game and see if this fixes the problem. If you go that route, make sure you don't forget to keep your savegames before uninstalling!

Maybe you should ask your question in the official support forum?

https://forums.obsidian.net/forum/104-pillars-of-eternity-technical-support-spoiler-warning/

I made a fresh intall of the game. Kana is still standing there.
I was thinking in using some save editor or something like that to get him back.
What do you think about that?

Not sure how a savegame editor would help you with your issue but it won't do any harm to try. Just remember to keep backups of your saves, in case something goes wrong.

From what i see, there is at least one in the link below:

http://forums.obsidian.net/topic/68141-savegame-editor/

Have fun!

I was planing to use that program.
I had to respect kana because he lost all his spells and songs.
I believe he lost some equipment, but he didnt has something special.