No.
Outside of the first few issues (which play up the "grim 'n' gritty" aspects almost for laughs), it's more just kind of somber and weird. A la that Rat King issue. Occasionally it does delve back into "dark" kill-or-be-killed action as in "Return to New York," but even then, yeah. It's nothing worse than the average not-just-for-kids comic.
Content-wise I think the weirder or more emotional stuff it gets into later might not go over incredibly well with kids, but there's nothing offensive or too dark.
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