By all accounts, the tag should be Ratatosk no Kishi, since danbooru, as far as I can tell, sticks to the Japanese title. I only really can think of Haruhi as an example though.
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Nevermind that this is an English speaking site and that most people that are looking for it are going to know it by its English title.
Anime is a different animal in this area since most people that visit sites like this watch fansubs, but there's no fan translation for videogames like Tales games.
Well, either way, it should be tales_of_symphonia_dawn_of_the_new_world or tales_of_symphonia_ratatosk_no_kishi - the way it is now is just a mishmash between the 2. (I only bring this up because I imported this game from Play-asia and am loving it, so I want to see the tags done right).
Guts_of_Eclipse said: But the one that the people that browse this site are going to be more familiar with should be the one that's aliased to, right?
No, not necessarily. We favor being pretty consistent with the Japanese names even when it's a little obscure. There's always the '?' link to the wiki page if explanation is needed.