I tagged a lot of the staff on the production page for WarioWare: Move It. Having a hard time with Nisshinken since they seem to be very much a secret developer. But one thing is for sure this game was split up almost evenly among the co-development companies.

Programmers
Yusuke Arai (Nisshinken Co. Ltd.)
Takumi Negishi (Nisshinken Co. Ltd.)

Nami Komuro (IS)
Ryosuke Kakutani (IS)
Yuka Nagatoori
Hiroshi Nagata
Masaaki Matsuura (Seems to have previously worked at ILCA/ORCA)
Yuma Yasuda (Safari Games)
Yuu Omura (Probably Safari Games? They're grouped in with the other staff)
Yasunori Suga (Safari Games)
Yasutomo Suzuki (Safari Games)
Tomomi Kobayashi
Ryo Takagi (TOSE)
Miku Hiura (TOSE)
Mao Honda (TOSE)

Director/Programming Director for Get it Together Yu Yamanaka only listed in Special Thanks. Working on another project or left during production?

Shinya Saito credited as one of the producers?

Music may have been entirely outsourced to T’s Music. IS has worked with them before (Rei Kondoh). I can’t find any credits for Jo Kondo, so it’s possible that they’re a new IS hire.

Chief Director
Goro Abe

Director
Waki Shigeta

Program Director
Yusuke Kitayama

System Program
Kenji Matsumoto
Atsuki Yoshinaga
Masahiro Oku

Program
Tadayoshi Hara
Tetsuya Satoh
Tatsuya Sengoku
Ryuki Hirano
Ryota Ishikawa
Ha Rongshan
Ryoma Yamauchi
Takamasa Shuto
Hiroaki Terada
Moe Ando
Ikuya Shimada
Naoki Hiramatsu
Koichiro Narusa
Takuto Wada
Yutaro Umezawa
Mitsuru Ohkura
Akinori Nagahashi
Yusuke Arai
Takumi Negishi
Yusuke Ahmed
Kyouga Tagawa
Takanori Yoshida
Kosuke Yurita
Phun Mun Hong
Naoki Nishikawa
Yuri Kojima
Shotaro Ueda
Ryoma Tanaka
Kohei Horie
Ryuji Oyama
Hikato Yamaguchi
Takeshi Noda
Sadaharu Ichimura
Hideaki Kanai
Haruki Kanno
Yuto Kuroda
Shogo Nakao
Atsushi Hashimoto
Hiraki Jikuhara
Futa Hirayama
Hiroki Fujita
Tomod Okuda
Hiroaki Matsukawa

Tool Program
Junga Kadono
Junko Tanaka
Kanako Hiroi

Art Director
Hiroki Kawamae

Production Art Lead
Satoshi Mizushima

Art
Norikatsu Furuta
Kiyo Sakamoto
Azumi Okamoto
Paul Patrashcu
Vo Phuong Anh
Yua Tanizawa
Eiko Hirao
Yuichiro Kubo
Kazuma Yamane
Yuki Oka
Manae Kiyomiya
Eishi Sekine
Midori Nakashima
Honoka Yano
Yukie Kuwa
Mizuki Kitao
Hiromi Sato
Mayumi Yasuda
Toshihiro Tanaka
Yasuko Miyoshi
Takafumi Yotsuji
Hiroshi Chiba
Junko Tsuji
Remi Ogura
Mayumi Takahashi
Ryuichi Ishii
Yumiko Morisada
Tatsuru Murakami
Lee Seungje
Haruka Kishiue
Yuka Takabayashi
Airi Nakamine
Daigo Tsuji
Ami Uchimoto
Kotaro Nagao
Mao Nakagawa
Fok Ching Hoi
Hiromi Otsuka
Asako Wada
Kumiko Nishimura
Rie Araki
Motohisa Tominaga
Yoshiaki Utazu
Yui Komatsu
Yukiko Naito
Iyo Sakagami
Arisa Nagashima
Aina Zushi
Shintaro Takaramoto
Yuya Okada
Mari Nakano
Hirofumi Iwasaki
Shota Kusaka
KantaImanishi
Yang Zhou
Masato Yamada
Yosuke Yuasa
Rumi Sasaki
Seiji Nakai
Hiromi Utazu
Takuya Ishida
Rei Akita
Masako Yokota
Eri Inoue
Masanori Kitao

Interlude Cutscene Lead
Mariko Hasegawa

Interlude Cutscene
Tohru Nakanishi
Shun Ooka
Satoshi Nakazono
Kenji Kitayama
Reo Sakamoto

Movie Lead
Rei Nakamura

Movie
Emi Shimazaki
Yuna Kanetaka
Ayaka Matsumura
Akane Honda
Mayumi Abe
Tomohiko Omae
Hiroto Taki
Takahiro Yoshimoto
Hironobu Kobayashi
Osami Abe
Jumpei Yamada
Haruya Kaneshi
Takashi Doi

UI Art Lead
Manami Takagi

Character Design
Ko Takeuchi

Production Coordination
Teruyuki Hirosawa
Osamu Yamauchi
Hidemi Yamaguchi
Hina Ito
Shunpei Ueda
Wataru Takane
Hiromine Okura

Planning/Writing
Nami Komuro

Planning
Ryosuke Kakutani
Yuka Nagatoori
Hiroshi Nagata
Masaaki Matsuura
Yuma Yasuda
Yuu Omura
Yasunori Suga
Yasutomo Suzuki
Tomomi Kobayashi
Ryo Takagi
Miku Hiura
Mao Honda

Sound Director
Daichi Ishihara

Sound Effects
Shoh Murakami
Shion Amaoka
Tomomitsu Matsushita
Janjeff Aquinde
Kousei Muraki
Yasayuki Araki
Ryo Kasai
Yohei Kobayashi
Yoshiki Kondo
Chihiro Matsumoto

Music
Jo Kondo
Haruno Ito
Shomo Murata

Sound Management
Takeru Kanazaki

Progress Management
Daisuke Nakajima
Naoya Yabe
Takumi Yamamoto
Takashi Yamaoto
Kenjiro Kato
Yuhki Mori

Development Support
Kenji Yamada
Yuji Mitani
Takeo Mori
Yuichiro Sasaki
Satoshi Shimomura
Daisuke Tagi
Toshiaki Araki
Yoshiyuki Kondou
Takahiro Ushiroda
Takeshi Asano
Hiroko Murakami
Rei Kondoh
Bungo Fujiwara

Co-development Company
Nisshinken co., Ltd.
TOSE CO., LTD.
SAFARI GAMES CO., LTD.
T’s MUSIC Co., Ltd.
TWOFIVE CO., LTD.

Techinical Support
Tomohiro Umeda
Takahiro Oyama

Testing/Quality Assurance
Masaharu Shima
Kanta Yokota
Aiko Takami
Isamu Kawase
Jeffrey C. Miller
Alexandra Borrero
Josh Yagi-Stanton
Mario Club Co., Ltd.
NOA Product Testing
AIQVE ONE Inc.

Artwork
Chiharu Sakiyama
Keiko Inoue
Takayoshi Matsui
Yuki Kozuma

NOA Logo Design
Dave Pauls

Special Thanks
Based on the work of Nintendo Games Develoment Teams
Megumi Inoue
Ryoji Yoshitomi
Yu Yamanaka
Tomohiro Yamashita
Communication Coordinator Group

Project Coordination
Masashi Okamoto
Hideaki Araki

Supervisor
Naoki Mori

Project Management
Katsuya Eguchi
Risa Tabata
Masa Miyazaki

Producers
Kensuke Tanabe
Shinya Saito
Atsushi Ikuno

General Producers
Shinya Takahashi
Toshiyuki Nakamur
Toshio Sengoku

Executive Producer
Shuntaro Furukawa