It could be Harry. He might be in a desperate situation where he has run out of options and has heard of Gibbs' reputation for getting things done. So, he decides to reach out to Gibbs for help.
There's also a possibility that a third party sets up the call. For example, a mutual acquaintance who knows both Harry and Gibbs and realizes that they could help each other. This third party arranges for Harry to call Gibbs, thinking that together they can solve a problem that neither could solve alone.
Tonks would probably be more likely to initiate. She's a confident and spontaneous person. She might see Harry looking a bit lost or out of place at the Yule Ball and just grab his hand to drag him onto the dance floor, not caring about any propriety or formalities.
Obviously Gibbs himself would be a main character interacting with Harry. He'd be like a father figure.
It could be Louis. He has always seemed very connected to the group's roots. In fanfiction, he might realize how much the fans miss the band and how much they all still have in common musically. So, he starts reaching out to the other members one by one to see if a reunion is possible.
Goku would be more likely. He is always open to new friendships and challenges. He has a curious nature and would be intrigued by Kefla's power. So he might approach her first to test her strength or just out of friendly curiosity.
It could be Naruto. He's known for his boldness and his ability to reach out to people. He might be the one to first notice Korra's unique qualities and be drawn to her, starting conversations and gradually building a connection that could turn into a romantic one.
Tim Drake from the Batfamily might be likely. He's highly intelligent and sometimes over - thinks situations. If he discovers some unusual activity related to Young Justice that he misinterprets, he could be the one to start the ball rolling on a conflict. For example, if he sees some new Young Justice members using untested tech that he thinks could be dangerous, he might take preemptive action against them.
However, Luke could also be the one to start the conversation. He is a young and idealistic Jedi, full of hope. He might want to reach out to his father, believing that there is still good in him. He could start the conversation with an attempt to understand Vader's journey to the dark side.
It could be Captain America. He is often the one to reach out and try to make peace or form alliances. He would see the potential in the Maximoff twins and approach them with an open mind and a desire to work together for the greater good.
Kelly Gibbs in 'Harry Potter' fanfiction could also be a character who is related to an existing character in the series in some way. She could be a distant relative of a Hogwarts professor or a long - lost family member of one of the main characters. This connection could bring new storylines and dynamics to the fanfiction, such as uncovering family secrets or using her family ties to gain access to certain parts of the wizarding world that were previously off - limits.
Ron is a likely candidate. He often has moments of immaturity and jealousy, like when he's envious of Harry's fame and attention. Gibbs, with his tough - love approach, might slap some sense into him. Another character could be Draco. His haughty and often mean - spirited behavior would probably not go unnoticed by Gibbs. A slap from Gibbs could be a wake - up call for Draco to change his ways.