He might interact with a sense of caution at first. Since it's an all - female world, the social dynamics would be different from what he's used to. He could be polite and respectful, trying to learn the rules of this new world. In terms of the 'lemon' aspect, if there's a romantic or sexual tension, he might be a bit shy or hesitant, but also intrigued.
To create believable characters, first, give them distinct personalities. For example, one character could be the strong and silent type, while another is very talkative and outgoing. Second, give them their own goals and dreams. A character might want to become the best artist in the all - female world, while another just wants to live a simple life. Third, consider their backgrounds. Maybe one character grew up in a wealthy family and has certain expectations placed on her, while another comes from a poor family and has had to fight for everything she has.
One possible plot could be that the male oc is initially seen as an oddity in this all - female world. He might struggle to fit in at first, but as the story progresses, he could form unique relationships with some of the female characters. For example, he could teach them about things that are typically male - dominated in our world, like certain sports or mechanical skills. The 'lemon' aspect could come in the form of some romantic or slightly more adult - themed encounters with one or more of the female characters, but these should be written tastefully.
The OC might interact with them in various ways. They could start by being in awe of their combat skills, like Ruby's speed. And in the harem aspect, they could show affection differently to each character. For Weiss, it could be through respecting her family name and helping her with her studies. With Blake, they might bond over books and their love for knowledge.
Goku would interact with Kale in a way that he wants to explore her powers. He might ask her a lot of questions about how she became so strong. Kale would respond with shyness but also with pride in her abilities. They would start to train together, and Goku would encourage Kale to push her limits. As they train, their relationship would grow, and they would become friends who trust and rely on each other in battles.
In a fanfiction, Madara might initially be dismissive of Sakura. But as she shows her strength and intelligence, especially when it comes to the significance of the lemon (maybe it has some sort of magical or medicinal property), he starts to respect her. Sakura, on the other hand, would be cautious around Madara due to his reputation, but she also sees the potential in him to help with whatever task involves the lemon. The lemon could be a catalyst for their interactions, like they have to protect it together or figure out its secrets.
They would likely have a cautious start. Master Chief is used to his own ways and the Female Arbiter has her own set of beliefs. But as they interact more, they might exchange combat techniques. For example, Master Chief could show her some of his advanced weapon handling skills, and she could teach him about her people's unique forms of combat.
One possible plot could be that the oc is a newcomer to this all - female world. She has unique skills or knowledge that the women in this world find fascinating. For example, she might know a special form of art or a different way of farming. As she interacts with the women, romantic and emotional relationships start to develop. Some might be jealous of her attention, leading to some drama.
The OP OC might initially struggle with the game mechanics. For example, if the game has a leveling system, they might not understand why they need to kill monsters to gain experience. But as they progress, they could start to use the mechanics to their advantage. They might figure out how to manipulate the in - game economy to get the best weapons and armor without having to grind for hours. They could also learn how to use glitches in the game's physics engine to access hidden areas. And if there are social mechanics like guilds or factions, they could either join one and try to rise through the ranks or create their own and recruit other characters.
They might interact with a sense of mutual wariness at first. The Female Spartan 117 is a product of human military might, and the Arbiter has a long history with the Covenant. But as they learn more about each other's goals, they could start to cooperate. For example, if there is a new threat emerging that endangers both humans and the Arbiter's people, they would have to put aside their differences.
Naruto would likely approach the female Alduin with his usual friendly and open - minded attitude. He would be curious about her and try to start a conversation. Alduin, depending on her personality in the fanfiction, might be aloof at first but Naruto's charm could break through her barriers.