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Ship To Ship Combat:
In the fandom, there's Wicked Fiyeraba vs. Gelphie. It can get... heated. The Gelphie fandom seems to be the largest, though, probably because of the quite big number of gay people in the musical theatre fandoms.
On fanfiction.net at least this isn't the case. The numbers on either side are pretty even, if anything more for Fiyeraba. Here there's no real combat either, the fanficers simply pretend the other ship doesn't exist - to the extent that if a Fiyeraba writer writes a Gelphie or vice versa they'll be congratulated by their normal fanbase on how original they're being. This troper discovered a load of reviewers she didn't even know existed when she wrote a fic that didn't involve either paring.
A common misconception about the fandom is that serious Les MisÚrables Ship-to-Ship Combat exists between shippers of Marius/Cosette and Marius/Eponine. In reality, particularly in modern day, fans tend to leave Marius/Cosette alone and ship Eponine with Enjolras, Combeferre, or Montparnasse.
Can get quite nasty among fans, with endless arguments over whether Christine should have ended up with brooding The Phantom of the Opera Stalker with a Crush the Phantom or Nice Guy Raoul.