Do we want to be consistent with numbering in our tags? There's generally two conventions, your standard 0-9, and roman numerals (i, ii, etc), and we're already using both. It seemed harmless at first, until I thought about games we haven't covered yet that would be numbered, and I saw...
Many people unfamiliar with the timeline confused Megaman X as being the "10th game in the series" rather than a separate series altogether. Now that we actually have a 10 to stifle that confusion, it's understood that X would refer to the actual letter, not the number.
Further research shows that I'm actually bad at memory and the first 6 games weren't numbered with roman numerals. However, the 5 games on the Game Boy were. Which means there's literally bother a [megaman-5] and a [megaman-v]. So it's really a confusing if you don't actually know the series to know that they're separate games.
In review, the majority of game tags we currently have do use 0-9, it's only a small handful that use roman numerals. Do we think it's a good idea we solidify the 0-9 system for numbering the different games in a specific series? Or maybe we really should just stick with how it is rendered in the actual game title, even if it can be confusing?