Here is the POV of Godzilla 90s

Seeing the Vortaak spaceships

What the...? What are these flying...things? Whatever they are, their a threat to me and my home. I'm going to stop this!

Fighting against Godzilla 2000

...Son? Is that you? How are you alive?... It doesn't matter, these "Vortaak" are controling you and I won't allow that! Besides, I want to see how strong you became.

Fighting against Anguirus

Anguirus...Don't worry old friend, I'll free you from these worthless insects! Although, I've always wanted a rematch...

Fighting against Rodan

These Vortaak insects are controlling you too? Don't worry, I'll snap you out of this.

Fighting against Megalon

Ah, the mighty has fallen. You, a so called "god" under mind control. Still, I own you a beating for Jet Jaguar.

Fighting against Gigan

You! You're going to pay for all the cuts you gave me and Anguirus!

Fighting against King Ghidorah

...Finally. Time to settle an old score.

Fighting against Mecha King Ghidorah

Didn't I destroyed you before? Oh forget it. I've crushed you once, I'll do it again!

Fighting against Destroyah

YOU! Now I can have revenge for my son!

Fighting against Orga

Hmm... A new face... This should be fun...

Fighting against Mechagodzilla 2

What the?! How are you..?! Whatever! I need to get payback for Rodan anyway!

Fighting against Mechagodzilla 3/Kiryu

...Father?