Welcome to Weight Gaming @Psyduck. You can check the #male tag, it will have some of the games that have male characters in them provided they are tagged correctly. Do note this is up to the topics author to add in, so if a game is missing this tag, or just because it is featured does not mean it features male weight gain (or doesn’t). But this should help you narrow down your search.
I would also recommend taking a look at the A user maintained list of games - Projects - Weight Gaming. It will have a good amount of games from the site on it (not all of them mind you) to help you narrow you’re search.
There are alot of these type of topics on the forum, feel free to look at a few I grabbed as it might also help.
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Any Male Weight Gain Games you can play on websites? - General Discussion - Weight Gaming
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male Weight gain themed games on Steam? - General Discussion - Weight Gaming
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Looking for male weight gain games - General Discussion - Weight Gaming
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Skyrim SE Male Weight Gain - General Discussion - Weight Gaming
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Any male centered weight gaining games? - General Discussion - Weight Gaming