Sega Genesis
Sega Saturn
Dreamcast
PS1
PS2
PS2 Slim (JP ver.)
PS3 Slim
PS4 Slim
PSP
Nintendo 64
GameCube
Wii
Switch Lite
Game Boy Advance SP
DS
2DS
Xbox
Xbox 360
Xbox One
A good amount, the oldest one being the 2600 (can you believe it is still going strong after 45 years?), and the newest being the WiiU. Off course I own most of the Sega consoles with my favorite being the Dreamcast.
In order, some no longer with me:
SNES (no longer here)
GBA SP
DS Lite
Wii (case modded green)
PSP (no longer here)
DSi
NES (no longer here)
3DS
GBA (arrived with broken screen, returned for below)
GBA SP w/ backlit screen
So if we're counting handhelds along with home consoles; Sega
Master System
Mega Drive 1 and 2
Mega CD (though it needs repairing)
Game Gear (again this needs repairing)
Sega Saturn
Dreamcast
Sony
PS2
PS3
PS5 (Had a PS4 but gave it to a friend)
PSP
PSP Slim
PS Vita
Nintendo
SNES
SNES Mini
N64
Game Cube
Wii
Switch
Game Boy Advance
Game Boy Advance SP
DS
DS Lite
3DS
Switch