Under your main header you don't have Dragon Age: Origins, just: Dragon Age Dragon Age II Dragon Age: Inquisition
With the Witcher, books and games are different, and different characters appear in the various games. I can't speak to the books as I haven't read them. But for example looking at characters on the most recent page under the Witcher tag: Iorveth and Anezka only appear in the second game, Regis and Detlaff appear only in the third game (actually only in a DLC), Olgierd also in the third game (a different DLC), Tomira in the third game, and so on.
But I will grant that it's all canonically one tag on AO3 (well, two, one for the books and one for the games) and since matching is on character it should not make a huge difference.
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Dragon Age
Dragon Age II
Dragon Age: Inquisition
With the Witcher, books and games are different, and different characters appear in the various games. I can't speak to the books as I haven't read them. But for example looking at characters on the most recent page under the Witcher tag: Iorveth and Anezka only appear in the second game, Regis and Detlaff appear only in the third game (actually only in a DLC), Olgierd also in the third game (a different DLC), Tomira in the third game, and so on.
But I will grant that it's all canonically one tag on AO3 (well, two, one for the books and one for the games) and since matching is on character it should not make a huge difference.