Somei Renji

Somei Renji (染井蓮二) is the leader of the Somei, 4th generation subgroup under Kirigaya, the largest Yakuza group in the Kasai Region. He shared a sake and sworn ties with the Miyama Group 5th generation leader Miyama Gaku to end the 60 long years of feud between two factions.

Appearance
Somei Renji is a fit old man who has a small stubble on top of his lips and chin. According to Tsubaki, Renji and Yoshino almost looks alike. In some sketches of when Renji was younger, he has the same purple hair color as his granddaughter.

Personality
Renji is a sociable, energetic fellow who has a lot of friends. He is also ridiculously good at net-working. He is also already an unrepentant delinquent when he was 15. Renji is also highly opened to acceptance, such as taking Shouma (who was a complete stranger had nothing to do with him other than hitting him) as his foster son. He also played with a lot of girl hence his mistresses although he has a wife. Renji also knows when to cool himself down to when things get serious. He also plays golf as his hobby.

He cares for Yoshino a lot, like calling her when she feels miserable upon Kirishima feels sickened by her and told her back to Osaka; Renji tells his granddaughter to at least stay in Tokyo for a while, treating Kirishima well then dump him. Another example is that he has beaten Shouma and Kirishima up as a punishment for putting Yoshino in danger. Although he is highly enthusiastic, Renji is also a trashy man in Yoshino's eyes. Renji is unpredictable and very powerful in fights.

Renji highly protects and prioritizes his family, and the death or murder of his son, Kyousuke has made him incredibly devastated even after a long time passed his death, however he has to restrain himself from mourning about it due to not wanting his depression to affect Yoshino. He wishes that Kirishima would protect Yoshino so that he doesn't lose another important family member of his again.

Somei Yoshino
Yoshino and her grandfather has a solid grandparent-granddaughter relationship. Back then, when Renji came back from his work after leaving Yoshino for years, Yoshino didn't recognize him. Renji also knows Yoshino's favorite flavor of sauce, and specially packed them in a luggage because Tokyo wouldn't be selling the same thing.

Renji is just as, if not more protective of Yoshino than anyone else, mainly because she is his granddaughter, and she is the only member in the group to have the same family blood as his. Due to her being mistreated and somewhat put into trouble, Kirishima and Shouma both got injured terribly, punished by Renji.

Somei Kyousuke
Kyousuke was the father of Yoshino and the son of Renji, who tragically passed away in a car crash. It was said that Kyousuke was never interested in the Yakuza life, and lived normally.

Unlike Yoshino, Renji is highly affected negatively by his son's sudden death, and has been repressed by this the entire time since. Renji held back his sadness over his son's death for a very long time due to not wanting his depression to affect Yoshino in any way. At this point, Renji wanted Kirishima to protect Yoshino, in order to not ever bring the same amount of despair to him again.

Miyama Kirishima
Much is unknown about their relationship. However, it is revealed that before actually falling in love with her, Kirishima already have a sort of connection with Renji. Renji was infuriated when he found out that Kirishima has threatened Osaka's territory and endangered Yoshino, and has beaten him up for doing his duty poorly.

Toriashi Shouma
Shouma is his adopted foster son, who he disallows him from having any form of relation from the yakuzas. He has expectations for him to have a bright future since he was abandoned by his biological father, and currently Shouma was sent into a private university in Kyoto by Renji. Similar to Kirishima, he was angered when he found out Shouma joined in the mess Kirishima made and fought a few thugs along the way, and beaten him up as a punishment as well.

Miyama Gaku
Gaku and Renji are friends, to where they declared the end of the feud between the two factions. Renji is also aware that Gaku and Kirishima shared a lot in common, like their looks and that they cannot drink beer. When they were younger, he had to carry drunk Gaku out of a bar due to the building having a fire once. At a certain point, Renji drove Gaku's expensive car off a cliff, and Gaku laughed at him before beating him as a result. Renji also reveals that he can never be as good in fighting as Gaku.

Hotei Taketa
Hotei is one of Renji's trusted underlings and he allows Hotei to babysit his granddaughter Yoshino.

Akashigata Tsubaki
Tsubaki is also one of his granddaughters, and is Yoshino's cousin. Tsubaki sees him as a complete role model of perfection and is impressed that Yoshino inherits a lot from him. Despite her affection to him, Renji seems to be mostly unaware of this. Tsubaki would come crawling to Renji like an avid fangirl, like coming to Hokkaido knowing that Renji would land in there after a trip to England at some point. Tsubaki also lied the fact that she likes spinach to Renji in order to impress him when she was a lot younger. She seems to find literally everything about him as great, even when he was meant to be scary.

Trivia

 * According to an extra, Renji is technically 58 years old canonically.