Based on years of experience moderating a public Discord server:

• Weirdest - Trails. Unfortunately, this is weird in the problematic way; think Pragmata. Some of the most well-known names in the fandom are that kind of weird. The series doesn't do itself any favors leaning into it a bit, too. Adding to it is the perception that series fans are gatekeeping when they tell you to play the series in order when in reality, yes, the developers are insane enough to keep building a continuous narrative that's gone 20 years, One Piece-style. Hard to convince people of that when video game series just don't do that.

• Nicest - Stardew Valley. I agree with the others here on that.

• Meanest - Fire Emblem. I've seen some wars, holy hell. Aside from general fandom insularity from out-groups, there are intense, internecine wars going on within the fandom over the newer parasocial elements in the series. And then there are waifu wars on top of that within the part of the fandom that's embraced the parasocial stuff. It's a fandom crucible.