You should use CLOB for that. Be aware that LOB columns don't perform as well as other column types because they do not make use of the Bufferpool memory caching.
If you can limit it to about 32000, you could use VARCHAR, but your tablespace and bufferpool pagesize would need to be 32K.
Do not use LONG VARCHAR, which is being depricated in future releases, and functions like a LOB but is limited ot 32K.