Lao Jack

Lao Jack (ロジャース) is a member of the Mecha Pirates, and a master.

Raised in by a master shipwright and mechanic, and later joining the  at a very young age, Jack gained vast amounts of experience and strength traversing the waters of the Grand Line as a shipwright.

Jack is an Assimilation Human(合体人間 Gattai Ningen), after he ate the, a Paramecia-type Devil Fruit that enables him to create constructs by combining inanimate objects whenever he desires.

History
When he was still a toddler, he threw his first punch and grabbed his first hammer, which was just enough for his family to begin teaching him the ways of boat-building, engineering, and martial arts. Maybe because building things was something he was surrounded with, at a young age he built various gadgets from toys and household items. A five year old Jack declared about how he was going to sail with the Happo Navy, even when he was still laughed at about it. However, his father, a former member, prohibited Jack from doing so, instead insisting him on either joining the Kano Royal Army or taking over their business as a shipwright and mechanic.

Jack, still determined, took his training seriously and by age 10, he was strong enough to kill a sea monster, while underwater. Even his adoptive father admitted the boy's incredible potential, and with that demonstration, the Happo Navy accepted the boy, though his father was to accompany him as their shipwright, and to also keep teaching him the craft. His adoptive uncle, a Grandmaster of Hasshoken and Jack's master, also joined them at that time as an official member of the fleet.

Since then, Jack sailed with the Happo, learning Hasshoken and working as a shipwright. They often sailed home, and Jack would then take time to spend with the few friends he had and work on his adoptive family's shipwright company and mechanic shop. Jack then sought to develop his style of shipwright, using more advanced technological features on the ships he built and fixed.

At seventeen years of age, Jack decided to not sail with the Happo for a while, and focus on working at his family's companies. Because of his height, skills, looks and superhuman strength, Jack became famous on the country and people often visited the docks to see his craftsmanship. Two years later, he decided to get even stronger, both at his craftsmanship and fighting capabilities. Jack isolated himself on a small, uninhabited archipelago nearby, for three and a half years. When he returned, JAck had transformed from an already powerful and skilled young man, into an absolute master shipwright and an astonishingly monstrous fighter.

During that time, he created his own Hasshoken style, and built various towns with advanced systems for food gathering, water filtering, and more, and hundreds of ships all by himself, by using only the resources he had at his disposal, and gifted them to the Kano Country, offering homes and work to the homeless, and resources to the country. He remained in Kano, further polishing his skills with the aid of his adoptive family.

Shin-ken
Shin-Ken (炎戒えんかい.八衝拳), is a variant of "Hasshoken" developed by Lao Jack. Similar to the, the style revolves around the generation and manipulation of vibrations which are sent through the air and ground, causing tremors. The user charges up vibrations with the Hasshoken style, and uses it to aid their strikes and defense.