“Companion / Follower” in Japanese is 侶, read ryo, ro, tomo (りょ, ろ, とも). 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 伴侶 (companion / partner).
What does 侶 mean?
Same sound, different character — the classic trap. Compare them side by side: