Ken Ikuji is credited on Pokémon Trading Card Game cards since 2003, with credits extending through 2018. The largest concentration of work appears in the EX series, including Team Magma vs Team Aqua and Hidden Legends, with additional appearances in releases such as Skyridge.
The illustrations combine cartoonish and realistic approaches, often set within landscape-aware scenes. Compositions tend to read as balanced and focused, shifting between simple staging and foreground–background depth. Color is frequently vibrant and warm, with occasional contrasting accents, supporting moods that range from lighthearted and serene to more intense, dramatic moments. A representative card is Moltres ex.