Cassandra's moveset is very similar to Sophitia's. She attacks with her shield more than Sophitia and does a bit more of kicking. She is also faster.
Cassandra's moveset is similar to her Soulcalibur II moveset with a few minor changes.
It's the same that Soulcalibur III.
Her moveset is the same as it was in Soulcalibur IV.