"My fellow North Koreans! Do not just sit and die of hunger but fight against Kim Jong-il," read one new leaflet from a group of activists that defected from the North.
It also suggested Mr Kim has had nine wives or consorts and accused him of living in luxury while millions of his people go hungry.
Other pamphlets called for the overthrow of Mr Kim and repeated claims he has suffered a stroke - a highly taboo subject inside the country over which his family has exercised absolute authority for 60 years.
"Your 'great' leader's last days are approaching. The dictator has collapsed from illness," another leaflet said.
The launches of the giant balloons - each 10m (33 feet) long and a metre in diameter - have worsened already tense relations.
The leaflets target ordinary North Koreans, largely cut off from the world
Last week, the North vowed to shut the inter-Korean land border on 1 December, citing the South Korean government's refusal to clamp down on "confrontational" activities, including the leafleting.
The move would cripple a Seoul-funded industrial estate developed in the North as a symbol of reconciliation.
The North also accused the South of violating a 2004 agreement to end decades of cross-border propaganda warfare.
While the Seoul government has halted activities and appealed to activists to stop their campaigns, the balloon launches continue.
The two Koreas technically remain at war because their 1950-53 conflict ended in a truce, not a peace treaty, and remain divided by a heavily fortified border.
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