When I was 14 or however old I was when
CV64 came out, I'd stare at the US box art which I assume consists of his drawings (not the cover obviously, but the sides and I think back all had hand-drawn art). Like, I wish there were a full-fledged official
Castlevania series artbook with hi-res, giant-print illustrations.
It's fun to have my love for those drawings come full circle with my love for his character designs and animation/directing style in select anime, realizing it's the same person.
According to Wikipedia, he also did the Japanese box art for
Contra: Hard Corps.