Is there any criteria on how present a character needs to be to be listed in a game's cast of characters?
Only Baldias is listed in Vastedge XT's character list, though the rest of the Conclave do make an appearance there.
Baldias is definitively mentioned because he the final boss of VXT. Chronus does talk in the game as well and needs to be listed. The issue that comes with VXT's character list is that we do not have full access to this game being defined as a semi-lost media we continue to work on as it is still conventionally unplayable, along with that the Conclave is mentioned in the wiki page itself. The characters section of Vastedge XT's page could use updating
Unfortunately our understanding and experience with Vastedge is limited and we are still often finding out new things. We have scripts but most gameplay footage we have is very much limited to those who own copies that willing to share and what limited things we can see from rom dumps. The lack of audio makes context difficult meaning if there is characters talking in certain sections that are without mention in the script we simply have no idea.
There is some level of tiering when it comes to characters being into the characters section of a page though such as playable and non playable characters. What counts as a character to be in the character section of a page is commonly such as are they there and if they have voicelines. We do have a page for incidental characters that are not significant enough to be on a main page.
We do think some of the Conclave members Axus and Libraria should be added onto the Vastedge page due to it being their debut game. Conclave pages in general need to be brushed up on.