This is KiryuGoji (the first one) played by Tsutomu Kitagawa
I really like this one! At first glance it looks like it could be a Heisei era suit, but this is one of the KiryuGoji suits from Godzilla Against Mechagodzilla, and Godzilla Tokyo S.O.S!
The spines are the dead giveaway for this suit! They have the same shape as MireGoji but without the purple tint that we see in the image below. We only ever saw this style of spine in the Millennium era films.
The only other suit with the millennium era spines in this color is the FinalGoji suit. We can rule out this being FinalGoji by comparing FinalGojis face to the one in the picture.
KiryuGoji has larger eyes and the whites of his eyes are more visible. FinalGoji (on the right) has more prominent ears, and you can’t see the whites of his eyes.
Here’s the thing though, there are actually 2 KiryuGoji suits. The second suit looks a lot like the first one, but it had a big scar on its chest. The lack of scar on this suit means that this is a picture from Godzilla Against MechaGodzilla, and not from Tokyo SOS, and that is how we know that this is the first KiryuGoji suit.