Well, Wattpad can be a good place too. There are many users who write Shugo Chara fanfictions with male OCs. The advantage of Wattpad is that it has a very interactive community. You can leave comments, vote for your favorite stories, and even follow the authors. However, you might need to do some more searching compared to Fanfiction.net or AO3 as there's a lot of content on Wattpad. But if you're patient, you can find some really interesting male OC fanfictions.
Fanfiction.net is a great platform to start. It has a large collection of Shugo Chara fanfictions, including those with male OCs. You can easily search for specific tags like 'Shugo Chara' and'male OC' to find relevant stories. Another option is Archive of Our Own (AO3). It has a more organized tagging system and often features well - written fanfictions. There are also communities on Tumblr where fans share their Shugo Chara male OC fanfictions or talk about ideas for them.
Chapter 369, "Who Makes Him the Omnipotent Male Lead?", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. The chapter gives readers a real answer by opening on But..." Lin Manru's tone shifted again, "Our studio has become...
Chapter 407, "Is this person here for a vacation or for survival?", is the clearest early answer because it turns Ye Chu's situation into a concrete plot event. Early on, These words quickly reached Zheng Xun's ears, and he marched over....
Chapter 369, "Who Makes Him the Omnipotent Male Lead?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from But..." Lin Manru's tone shifted again, "Our studio has become...
Chapter 360, "There's No Shame in Wearing a Dress Designed by Your Mother", is the clearest early answer because it turns Jin Siyue's situation into a concrete plot event. It opens with Jiang Li showed no fluctuations in emotion and remained unperturbed...
Chapter 273, ""Justice Will Eventually Triumph Over Evil", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Li, who was reading a book, suddenly jumped in fright.
Chapter 491, "A Cleaner Handling", is the clearest early answer because it turns Are's situation into a concrete plot event.
Chapter 619, "The Feast of Fish CP Is Indeed Real!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 288, "The Old Master Already Knows", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Li and Zhao Lang were lifted onto stretchers and taken to...
Chapter 484, "Gu Yu Returns to the Country!", is the clearest early answer because it pushes Bai Lu into a new phase or setting. The chapter gives readers a real answer by opening on More raw meat aroma wafted over, and the boar that was on its last...
Chapter 583, "Making a Fool of those Big Shots!", is the clearest early answer because it turns Making's situation into a concrete plot event. Early on, Days before, Jiang Li had predicted that today would bring a great.... By the end, You can play the game this way?!.