I was planning on making merch of utaite like atr for a con in the summer BUT I'm not sure if it's allowed. I know in the US at least 80% but probably more like 90-95% of the people who make fan merch don't confirm or ask the original companies/developers/basically who ever owns the series/character etc. that they're making merch of and don't get in trouble, probably because they aren't racking in billions from it and the companies don't have time to fine everyone who's ever made fan merch (and in some cases art too) of their copyrighted character, but copyright laws in Japan are way more serious.
As I said, with fan merch of anime the audience is usually a lot greater than the audience that the utaite fandom attracts so if an utaite decided they wanted to sue people who made unofficial merch, it would be easier to track most of them down. Japanese fans will also usually not hesitate to report you if they find your merch being sold (I've seen it happen on twitter to a Japanese artist that draws USSS a lot. If they go after fellow Japanese people I think they'd go after international fans even more since there are a number of JP fans that don't like the international fans since there was some trouble before in a soraru livestream I believe...).
I've never been at an international con before or a Japanese con but in a Japanese con I don't believe there are many people who sell utaite fan merch there (since a lot of utaite actually go sell their stuff there) but I wanted to know what the wiki people think, since it's the largest organized site of utaite related material (that I know of, since there are sites in Japanese, Chinese, Korean etc. that I've seen but it didn't have a database as large and clean as this wiki) and some utaite have even noticed it and also the admins have a large understanding of what is ok and what's not (not saying you're all perfect humans and know everything but just more than an average fan) so I wanted to ask for your opinion.
Of course I will email all the utaite that I'm interested in making merch of for permission, but (I shouldn't be saying this but) even if I don't get a reply (if I'm rejected completely like "no, you are not allowed to" then of course I won't because it would look super awful on me as a person), I still want to consider selling them. It wouldn't be for much but I wanted to know is it generally allowed and worth all the trouble considering copyright/trademark policies? (Utaite signed with labels are more of a pain but still considered)
This was super long but I appreciate any suggestions I get!
(P.S. I'd prefer if your replies took permission into account of your opinion so not just "yes make merch! We don't have enough utaite merch!" but something like "yes, if the utaite gave you permission". Thanks)