I hate everything about this chart lol.
It makes Red XIII look big enough to ride. He's far smaller than this, barely reaching knee level of the rest of the cast.
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Aerith and Tifa are basically the same height. I think Tifa's game model is a hair taller.
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And not only is Sephiroth's game model the same height as Barret's, but the game frequently cheats him even taller than that for dramatic effect. Here Cloud is eye level with Seph's chest, whereas for most of the game, Cloud is a bit taller than Barret's shoulders.
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Just popping this on to the end here, Barret only looks shorter in that shot because he's further away from the camera, it's just perspective. While all the NPCs in these shots are also further away and thus subject to perspective, they're also all clearly looking
up at Cloud, if you look at their sightlines.
And yeah, I'm a huge nerd about character scaling lol. All these numbers people bring up are from the original game and that whole game is chibi, there was no need to be consistent back then, whereas with Unreal engine specifically (and most modern game engines generally) things are done in real world scale for physics calculation reasons. However tall the game models are
is how tall they're "actually" supposed to be (keeping in mind that animation frequently cheats characters higher or lower off the ground for the sake of composition).