JAPANESE EXCLUSIVE This feature is exclusive to the Japanese version of The Battle Cats but it may also appear in other versions such as BCTW and BCKR!
Kitarou has low overall stats (excluding range), and his slow isn't something to be feared about as it only lasts for two seconds.
Strategy
As usual, use anything that can outrange this enemy. If for any reason the slow effect makes you think he is a threat, bring Cat Units that are Immune to Slow.