This is going to sound totally off-topic but did you ever read Archy and Mehitabel?
The way you describe Bart reminds me of Archy and Mehitabel. A&M is more dated, however. This page sums it up nicely. I mean, I think A&M is more lighthearted than Bartcop. Don Marquis wrote a daily column for a newspaper and introduced A&M as a weekly kind of break from I think the usual pressures of a daily column. Archy is a cockroach who writes the columns by jumping from key to key on an old manual typewriter. (See, it is dated - this stuff started coming out in 1917.) But the page describes the columns as: You might enjoy it, you might not. The columns were brought together and published in books - the one I read is "Archy and Mehitabel," which is the first volume. Archy has given me truisms like "Prohibition makes you want to cry into your beer, but denies you the beer to cry into." from certain maxims of archy It's kind of prose poetry. I don't know how much you go in for that sort of thing. a mix of news commentary, doggerel poetry and short sketches.
Those who might think there’s little substance to Archy’s lowercase commentary haven’t read enough. Archy and Mehitabel are remembered as comic characters, but often Don Marquis’ light verse was a veneer on blunt social criticism.