Ishizuka was known for his deep, strong voice and is often cast in the role of older mature male characters, such as Jet Black from Cowboy Bebop, Eugene Gallardo from Tales of Rebirth and Captain Matthews in the Xenosaga trilogy.
Ishizuka dikenal karena suaranya yang dalam dan kuat dan sering berperan dalam peran karakter pria dewasa yang lebih tua, seperti Jet Black dari Cowboy Bebop, Eugene Gallardo dari Tales of Rebirth dan Kapten Matthews dalam trilogi Xenosaga.