FKJ

It's the electric piano used in "(embrace) Boredom" and that we can see during the video.

First Instrument on rack in Instagram photo

Custom Sandberg California VM5 in FKJ live @ Salar de Uyuni for Cercle

He uses Whammy with slapback delay in his FKJ Improvises from Home Video.

Looks like a Boss FV-50H Stereo Volume Pedal on his board during the live performance.

In this youtube video of "On My Own" posted on Jul 18, 2019, you can see at 0:12 that FKJ's playing a Gibson ES-335. Judging by the inlays it's a Dot model.

In the YouTube video titled "FKJ MELT 2019 FRENCH KIWI JUICE" by Ramon T, FKJ is seen using a Fender Pawn Shop Bass VI during the live performance.

In FKJ's NPR Tiny Desk concert, FKJ can be seen using the Sequential Six Trak at 1:40 into the video.

In a YouTube short titled "Why FKJ Loves Soundtoys Plugins," FKJ mentions using the Soundtoys EchoBoy Analog Echo Processor.

Ludwig Breakbeats drum kit is in his studio in this photo.

Tama 1st Chair Round Rider Drum is in this photo.

In a video produced by Fender titled "Re-Creation: FKJ | American Acoustasonic Series | Fender," the artist FKJ is seen playing a Fender American Acoustasonic Jazzmaster at the 0:08 mark.