Inverting the Sailor Earth trope?

I'm working on a fanfic starring a team consisting mainly of OCs, but there's a canon character who joins them as a Sixth Ranger. He has plot-relevant and canonically sound reasons for showing up, and also provides some important foreshadowing, but I'm afraid that, as a fan favorite, he might overshadow the OCs. Any advice on how to handle a situation like this?

I'd say it's to be expected, because when most people read fanfic, they read it for the canon characters, and if you happen to add an innovative or interesting OC, that's just a side benefit.

Ah, that makes sense. So this isn't something to worry about?

So in your fanfic the structure of the team lends itself to including canonical characters? If so (and also because of the comment in #2 above), I'd say that your fanfic may have a problem or issue with not including enough canonical characters.

Don't take this the wrong way, but 50 Shades of Gray (an independent work) started out as a fanfic of Twilight, and I wonder if your fanfic might lend itself to being its own thing with an Expy or two (i.e. the canonical characters from the work this is a fanfic of).

It's the plot that's conducive to the character showing up, rather than the team structure (which is just being put together over the course of the story). So it's not so much an inversion of Sailor Earth as a subversion of Elsewhere Fic. My mistake.