You can try some stuff to "check" the chars:
- get rid of all items in inventory/char (avatar...)
- clean the storage
- delete guild
- delete quests
- teleport char back to jangan (maybe you tried it already because 25000 = Jangan)
- delete skills and masteries
- maybe some more stuff

- upload a dmp file for us
If you compare the chars you can see:
- it seems all chars belong to one or two users (6 or 2 + 4)
- the 4 chars you queried from the DB were logged in before and usable
- lv range 71 to 90 -> Mt. Roc, Jinsi Cave,. DH cave issue? region 25000 and -32767 + world ID 1 should be good
- maybe all chars were logged in in the same party, guild, area...
- maybe ask the user(s) what he/she/they did before being crashed from the game
It is quite strange that 4 chars from accounts with similar ID's do not work. If you get a crash from using items you do not try to login 3 more chars and crash them too. Same with skills, quests and so on...