Heinrike Prinzessin zu Sayn-Wittgenstein, referred to as "Prinzessin" (princess) by other witches due to her long name and highly noble lineage, is of Orussian aristocracy which later emigrated to Karlsland. It is a distinguished clan with influence across various European states, especially some people in her family have very deep connections to the royal family of Baltland. Her ace archetype is Heinrich Prinz zu Sayn-Wittgenstein. (Source: Strike Witches Wikia)
Fernandia Malvezzi is based on Italian pilot Fernando Malvezzi. Graduate of a military academy for witches in Romagna. With a small degree of skill in healing magic, Fernandia was assigned to the magic medical corps, but she actually had a strong desire for a combat role. She snuck herself into a ground attack witch unit, one of the understrength sections of the Aeronautica Romagniana (Romagnan Air Force). After studying tactics with a Karlslander dive-bomber squadron, Fernandia, together with her best friends Luciana and Martina from the academy, flew many missions, even recording a destroyed heavy land Neuroi to their name. In recognition of the team's fame and overwhelmingly positive evaluations, all three were given the honor of being admitted into the Pantaloni Rossi (Red Pants). Not long after, Fernandia's unit was equipped with MC.202 Strikers. Her experience with those enlightened her towards air combat, and ever since '44 she has been using the G-55. Even though Fernandia can be extremely self-assured, headstrong, and impulsive, she also displays an undeniable friendliness, and she is a natural leader with the power to get others to do things her way. Within the team, she takes the role of commander and also vanguard. (Source: Strike Witches Wiki)
"I'm Shoukaku, the first of the Shoukaku-type carriers. I will try my best with Zuikaku to try and live up to the names of my seniors in the first and second aviation divisions." - Shoukaku (Source: Kancolle Wikia)
Hattori Heiji is a high school detective from Osaka, titled Great Detective of the West. He came to Tokyo to test himself against Shinichi. Thanks to his detective skills, Heiji eventually figured out that Conan is the brains behind Mouri, and that Conan is in fact Shinichi. The two become good friends after that, working on cases together when the opportunity arises. Occasionally Heiji gets Conan into a tight spot by calling him Kudou in front of Ran, but thanks to his puns, everything always seems alright. Heiji has a strong Kansai accent and he can't seem to speak standard Japanese because his accent is so strong. Heiji is the son of the Osaka district police commissioner (a position at the top of the hierarchy), but Heiji prefers to get by on his own merits. Heiji gets his slightly dark skin from his grandfather. His childhood friend, Toyama Kazuha, has a budding, but denied romance going with him. In Detective Conan's 7th movie, it's revealed that Kazuha is apparently Heiji's first love, but Kazuha didn't know about it. (Source: Tanteikid.com)
Tooyama Kazuha is the childhood friend and romantic interest of Hattori Heiji. Their fathers work together at the Osaka Police station, where Kazuha's father, Tooyama Ginshirou is a subordinate and close friend of Heiji's father, Police Chief Hattori Heizou. At one time in their youth, Heiji had had the unfortunate idea of locking themselves together with a set of old handcuffs which had no key to unlock it; as a result they involuntarily had to spend time together even on some rather intimate occasions (i.e., bathroom visits) before the cuffs could be removed. As a reminder of this 'closeness' and for good luck, Kazuha fashioned two identical lucky charms, each incorporating a chain link from the cuffs, which she and Heiji have been wearing ever since. At some later point, Kazuha added a picture of Heiji into her own charm pouch. Kazuha has a hot temper and can be highly critical of people around her. She has been hinted to have a high level of intelligence, as she was able to deduce a dying message in an episode even more quickly than either Ran or Kogoro could (albeit with slight help from Heiji). Moreover, she is highly confrontational and unafraid to let others know of her dislike, even showed no hesitation or concern confronting Heiji in men's restroom. This trait leads to frequent shouting matches with Heiji, but it also allowed her and Ran to forge a strong friendship. She also has a marked belief in spirits, good-luck charms, and other superstitions. Right from her first experience, she displayed her belief in the importance of hers and Heiji's omamori, charms which Kazuha made to protect her and Heiji from harm. And indeed, during the same case, Heiji lent Conan his omamori, and the metal inside the charm stopped a knife blade that would have killed Conan. On subsequent cases, Kazuha is quick to attribute mysterious shadows and strange events to ghosts and other malignant spirits, which usually sends Ran into a panic as well, though she herself does not possess a morbid fear of ghosts as much as Ran does.
Kazuya is another one of Tsukushi's childhood friends. He enrolls at Eitoku after his family comes into money through some real-estate deals. The other students at Eitoku draw a sharp distinction between Kazuya's "new money" and their "old money." The F4 in particular mention this difference fairly often. Tsukushi is both relieved to have a friend at Eitoku, and worried for Kazuya's safety if he continues to hang around her. She is particularly worried about Domyoji, who clearly considers Kazuya a romantic threat. Kazuya is fiercely loyal to and harbors romantic feelings for Tsukushi, but also relatively clueless and not very quick to pick up on things. He is not featured in the drama. (Source: Wikipedia)
Another member of F4, Sojiroh is quiet and very interested in the tea ceremony, which is his family's business. For the most part, he and Mimasaka usually work to keep the peace within the group and following Domyoji. In season two, he reunites with his first love, whom he had believed had only loved his brother. Later he learns that she had truly loved him, but the relationship is unsalvageable (in the manga they both recognize that they missed their one chance to be together, and in the drama she has become engaged to someone else). Makino's close friend, Yuuki has feelings for him and it is uncertain whether he feels the same way. He is also one of the two playboys in the F4. (Source: Wikipedia)