In solo piano, chamber music and concertos, Fukuma has acquired a substantial and varied repertoire of no less than forty concertos. He has played rare concertos such as those of Englund (1955), MacDowell, James MacMillan and Hermann Goetz. He also plays the concerto for two pianos by Tōru Takemitsu.
In July 2016 he played Brahms' Concerto No. 2 "at the last minute" replacing Nelson Freire, with the Orchestre National du Capitole de Toulouse under the direction of Tugan Sokhiev at La Halle aux Grains in Toulouse. Passionate about contemporary music, he has created national and world premieres of works by Tōru Takemitsu, Matsuo Shishido,Farhad Poupel,[2]Renaud Gagneux, Thierry Escaich, Thierry Huillet, Einojuhani Rautavaara, Seongju Oh, Francesco Milita, Pascal Zavaro. For the Naxos label he has recorded the complete music for piano by Takemitsu.[3]
Fukuma is the youngest pianist to have recorded at the age of 25 in 2007 the complete Albéniz' Iberia published in Japan by Harmony Japan in 2008 and published for the world outside Japan by Éditions Hortus in 2012. His recordings have been praised in most trade magazines (such as Gramophone in Great Britain) or in the daily press, particularly in France in the evening newspaper Le Monde which, in its edition dated Tuesday 30 September 2014, attributed to Kotaro Fukuma "magician fingers" about the Dumka record, and in books about piano.[4] Fukuma also likes to perform with other artists in shows that combine figure skating (Ice Legends, Fantasy on Ice, in 2014, 2015, 2016, with Stéphane Lambiel) or theatre (Le Rappel des Oiseaux - after Gogol's Diary of a Madman, with Paris Opera star dancer Mathieu Ganio, directed by Orianne Moretti - Paris 2016 and 2018). French critics see him as"... a major figure of the young contemporary piano".[5]