Well, in ace marco ticklish fanfiction, one characteristic could be the exploration of the relationship between Ace and Marco through this unique aspect. It might also involve some description of their personalities in relation to being ticklish. Maybe Ace is shown as more easily flustered by it while Marco has a different kind of reaction. Also, the settings in which these ticklish moments occur can vary, from a casual gathering among friends to a more intense situation where the ticklishness serves as a way to relieve tension.
In ace marco ticklish fanfiction, the characters' physical and emotional responses to tickling would be important characteristics. There could be a lot of description about how their bodies react, like squirming or laughing uncontrollably. Emotionally, it might show a more vulnerable side of them. Additionally, the plot could revolve around the discovery of this ticklishness, perhaps one character finds out about the other's ticklishness by accident and then uses it in different ways throughout the story, whether it's for friendly teasing or as a way to bond more deeply.
I'm not sure specifically which 'ace marco ticklish fanfiction' are highly recommended. You could try searching on some popular fanfiction websites like Archive of Our Own (AO3). There might be various works related to these characters with such themes.
Another common theme is adventure. Writers like to send them on all kinds of exciting adventures, like exploring uncharted islands or facing powerful enemies.
One possible scenario in this fanfiction could be that Ace and Marco are facing a powerful and unknown enemy in a spooky, haunted island. The island is filled with strange noises and dark shadows. Ace's fire powers seem to be ineffective against this new threat as it keeps disappearing and reappearing. Marco, with his phoenix abilities, tries to scout from the air but gets caught in some sort of dark mist. They have to rely on each other and their friendship to overcome their fear and find a way to defeat this mysterious foe.
The theme of growth in their relationship is also prevalent. As they come to terms with being soulmates, they grow both individually and as a couple. They learn to understand each other better, communicate more effectively, and support one another through difficult times, which is really beautiful to see in these fanfictions.
One popular storyline could be about their adventures together on a mysterious island. They might discover ancient secrets and have to work together to overcome various obstacles, like fighting off strange creatures or solving complex puzzles.
Common themes can vary widely. However, power dynamics might be one. If Ace and Marco have certain powers or abilities, and the wolf represents a different kind of power, there could be a struggle or a balance to be found. Also, mystery could be a theme. The 'dip' element could be something mysterious that they are trying to figure out, and this mystery could drive the plot forward, with the wolf perhaps being a part of the mystery or a key to solving it.
Marco and Ace are close comrades and friends in the manga. They have a deep bond within the pirate crew.
Growth is a prevalent theme. As they go through various battles and experiences in the fanfictions, they grow both as individuals and in their relationship. Their understanding of each other and their own abilities develops. Additionally, the theme of brotherhood is strong. They are like brothers in the crew, and this brotherly love is often a central focus in these fanfictions.
One common theme is friendship. Ace, the reader, and Marco often form a strong bond of friendship that can withstand various challenges. Another theme is adventure. They might go on quests or face dangerous situations together. Love, in a platonic or sometimes romantic sense, is also a theme. The characters care deeply for each other and support one another through thick and thin.
Friendship is a very common theme. Given their relationships in the original story (assuming it's One Piece - related), fanfictions often explore the deep bond between Marco, Ace, and Thatch. They might show how they support each other through various challenges.