Funada Ikkin signed his finest dragon with the name of his province and the poetic era-name Shohei, "Ushu Shonai-ju Funada Ikkin Yoshinaga" with his , and made it, the published sources record, on the order of his lord, the Sakai house of Shonai, in Koka 2 (1845), when he was thirty-four. He was born in Bunka 9 (1812) at Tsuruoka in Dewa-Shonai, the son of Funada Kantsune, a pupil of Iwamoto Kanri. Losing his father young, he was raised by Kumagai Yoshinobu after his mother remarried, and in Bunsei 9 (1826), at fifteen, he went to to study under Kumagai Yoshiyuki. In Bunsei 11 (1828), at seventeen, he entered the school of Goto Ichijo and trained there for seven years in Kyoto. He then returned to , opened his own workshop and became the retained metalworker of the Sakai house. He died in Bunkyu 3 (1863) at the age of fifty-two. His family name was Funada, his art-name Ikkin and his given name Yoshinaga, and he signs Funada Ikkin Yoshinaga, Funada Ikkin, or at times simply Ikkin.
The published sources place him first among Ichijo's pupils. They call him a leading pupil and the prodigy of the Ichijo school, and with Imai Nagatake, Hashimoto Isshi, Nakagawa Issho and Wada Isshin he was counted among the Five Tigers of that school. Kano Natsuo, they record, named him the first of the five and the most skilled at high relief: "Ikkin is the first among them and excels above all in high-relief carving". The 's commentary adds that he was skilled in both and , but that in kosuki-bori, the scooping chisel cut deep or shallow at will, he admitted no rival. Ichijo himself, the published sources say, was moved to lament that "kosuki-bori lies beyond my reach".
His material is the orthodox one of his Goto-derived training. The and are of , carved in with gold crest work and , the reverse plates covered in gold, and the are worked in solid gold in full . On the and the is left with a hammered or a stone-textured surface, carved in kosuki-bori and with gold and silver . Of one such set of the Four Gentlemen the commentary writes that "the kosuki-bori, free in its depth and shallowness, is splendid", the gold and silver flat inlay setting off the , the whole filled with a clear, refined elegance. On a dai-sho pair of the same subject, dated Bunkyu 2 (1862), a trace of the favourite kosuki chisel shows in the carving of the plum, and the itself is described as having character rather than being flat.
His subjects are those of the Ichijo school and the Goto house. The Four Gentlemen, orchid, bamboo, chrysanthemum and plum, the published sources call a theme in which the Ichijo school most excelled, and they return to it on several sets. The crawling dragon is an established Goto subject, and one record calls the dragon unusual in his work. Of the Shonai dragon set the commentary writes that the modelling is "especially full and overflowing with power", the chisel vivid, triangular strokes used to effect on the horns, cheeks and feet, and calls it "a work to be named the finest among his pieces". In another of its records his skill there is said to approach his master's, "a work overflowing with power and skill". A second dragon set, in alone with slender coiling dragons, is "a strong work by Ikkin, bracing and full of spirit". His range also takes in the - deities of harmony, a -crossing dragon with the Shakkyo lions, a group of tigers and leopards across a complete fitting set, and an Okina dancer in gold on a polished , of which the commentary writes that "one is made to see that he is indeed a gifted talent of the Ichijo school".
The published record measures him against his teacher throughout. A set of the Four Gods carries the qilin and phoenix that appear in Ichijo's own work, and his Okina follows a composition also found among Ichijo's pieces; again and again the commentary says his skill approaches his master's. One dai-sho pair of the Four Gentlemen is signed as made after an under-drawing by the Hokkyo Ichijo, the large guard by Ikkin and the small by his fellow pupil Hashimoto Isshi, yet the manner is Ichijo's own. From it the draws a documentary conclusion: "it may be inferred that among works bearing Ichijo's signature there were included substitute works by his many pupils". On another set the small alone were supplied by his colleague Nakagawa Issho.
Ikkin's record is eleven works designated , two of them raised to , and every one carries his signature. Dated pieces run from Koka 2 (1845) through the Kaei era to Bunkyu 2 (1862), and several carry his workshop address, "at Imuke-no-sato in Buyo," in . Sets were made on the order of the Sakai lords, among them the Shonai dragon set and the Four Gods set of Ansei 2 (1855), which passed down in the Shonai Sakai house. The dragon set is kept in a Ryushido box with an inscription by Ikeda Takao. No current institutional holder is recorded against his work. Signed sets by a master of his standing among Ichijo's pupils come to light from time to time rather than often, and a kosuki-bori or a dragon set in high relief represents the side of his art the published sources praise most.