In locative inversion, the verb immediately precedes the subject (or the subject's modifiers). "Under the tree sits a sad boy." If the verb has a modifier, then a helper verb is inserted right before the subject: "Start brawls in bars do [the] fighter, cleric..." "Going up the hill are Jack and Jill." Note how nicely the progressive splits into a participle and copula.
Usage comes into play here. Every sentence should answer a question (whether or not one has actually been asked). The choice of sentence structure is dictated by the question. The better style is to put the "news" at the end of the sentence. "On the table is my pen." [What's on the table?"] My pen is on the table." [Where's your pen?] The news is at the end.
Thus, if you want to tell us who starts brawls, use the locative inversion. But if you want to tell us what those rascals do, say "The fighter, cleric... start brawls in local taverns."