I love Stardew Valley, but since Sam already recommended it, I would have to say that one of the most fun games i've ever played with Pedians online is smash bros ultimate. The fast paced fighting style it has combined with the game's unique quirks here and there makes it, no pun intended, the ultimate smash bros experience. There's toxicity here and there, but that naturally comes with a fighting game, and it usually dies down pretty quickly. (sometimes it lingers in the air for a bit tho)