“Shadow / Silhouette / Phantom” in Japanese is 影, read ei, kage (えい, かげ). It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 影響 (influence).
What does 影 mean?
Same sound, different character — the classic trap. Compare them side by side: