That's a Sidekick. As party members, they level up the same as player characters. Technically Sidekicks don't have CRs (or I didn't see any in the stat blocks in the source material), but if you compare them to PCs, who effectively have a Challenge Rating equal to their character level, then it makes sense to give them a CR equal to their level.
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Helpful rewriter of Japanese->English translation and delver into software codebases (she/e/they)
See https://www.dndbeyond.com/monsters/warrior-level-8 - the Cr has been made the same as the level
Monsters I made or adapted from other sources for use here.
That's a Sidekick. As party members, they level up the same as player characters. Technically Sidekicks don't have CRs (or I didn't see any in the stat blocks in the source material), but if you compare them to PCs, who effectively have a Challenge Rating equal to their character level, then it makes sense to give them a CR equal to their level.
Helpful rewriter of Japanese->English translation and delver into software codebases (she/e/they)
DDB needed to match CR & Level to have the PB come out right in their system for the saving throws, etc.
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