The reason is simple, because there are no questions.
Tags exist when there are questions using them. from the privilege on creating tags
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The new tag will now be available for all other community members to use, without needing the new tag privilege. It will also show up in the moderator tools new tag report.
However, note that:
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Please create new tags responsibly!
as such no Dragonball Multiverse questions have been asked. of cause whether or not Dragonball Multiverse is on-topic or not is another question which should be asked separately because in the past questions on fan made story content of known series like Dragonball have been off-topic
also because tonight i have that twitch which makes me want to correct this
But it is still a manga
no it isn't. as per their faq under But you're allowed to do that?...
In japan, fan-comics like this one, named Dôjinshi, are very popular and numerous.
this tells me that they aren't a manga like Dragonball Z but a Dojinshi like Magical Girl Noir Quest, Mahou Shoujo Lyrical Nanoha - Al-Hazard or The Legend of the Sword of the Day and the Sword of the Night and also because they compare Dragonball Multiverse with Dojinshi rather than saying it is Dojinshi i'd say it's separate from them but that last part in my opinion.