A Person affected by Dravet's Syndrome can experience any or all of the types of seizures:
During Tonic seizures the limbs and body of the person affected go completely stiff.
During Clonic seizures the limbs and facial muscles twitch and jerk.
Tonic Clonic seizures occur in two different phases. The first phase is the Tonic phase, in which the limbs of the body go stiff. A person experiencing this may stop breathing. The second phase is the Clonic phase and during this phase the limbs and facial muscles jerk. Breathing normally picks back up in this phase.
Myoclonic seizures are typically short in duration and involve quick tightening of various muscles in the body, usually occurring simultaneously on both sides of the body
As referred to as "drop attacks," Atonic seizures can be very dangerous to a person's body (especially the head and face) as these seizures cause a sudden loss of muscle control. They often lead to body collapse, etc. as the limbs turn rubbery or noodle-like.
Much like the name implies, Absence seizures are momentary losses of awareness and consciousness. A person undergoing an attack of this nature would have a vacant stare and appear as if they are daydreaming.
During Complex Partials a person is unaware and unable to control their body, speech, etc. A person affected by this will not remember anything that happens during an episode.
Different from Complex Partials, during Simple Partials a person is fully aware of what is happening to them and occurring around them but cannot control his or her self.
The information from this post came from the Epilepsy Foundation at: