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Description
Sorry, but I had to fit them all in a clear identifiable scale.
So this is the reference to the major UnderAnomaly characters. In height order, just for my future reference.

There are some missing characters, such as Genocide, which is another name for the Void/Chara fusion. Also Hyperdeath/adult Asriel, but he's the same size as my Omega Asriel form. It's just some different attributes.

So, here's our order:
Flowey- Bright yellow
Frisk- Red
Chara- Dark crimson
Monster Kid
Asriel- Green
Alphys- Light orange
Sans-Blue
Papyrus-Orange
Undyne- Navy
Mettaton EX- Pink
Gaster (Standard form)- Gray
Toriel-Purple
Omega Asriel/Hyperdeath- Dark green
Asgore- Yellow
Specimen-000- Light gray
Gaster/Void (battle form)- Monochrome gradient
Angel of Death- Rainbow Spectrum
Omega Flowey-Basic colouration

Other notes:
Specimen 000 usually is a lot smaller, but the form shown is the 'true form'.
Genocide is roughly smaller than the Angel of Death Asriel.
Gaster's 50% Void form and 'Companion' Form are not importatr, so they're not included.
Chara is a little taller than Frisk, but they appear to be same height.
Void is shown in his largest form, but he can shrink down at will.

*** Some characters are bent down, appearing shorter. They are in order of full height.

Description
Sorry, but I had to fit them all in a clear identifiable scale.
So this is the reference to the major UnderAnomaly characters. In height order, just for my future reference.

There are some missing characters, such as Genocide, which is another name for the Void/Chara fusion. Also Hyperdeath/adult Asriel, but he's the same size as my Omega Asriel form. It's just some different attributes.

So, here's our order:
Flowey- Bright yellow
Frisk- Red
Chara- Dark crimson
Monster Kid
Asriel- Green
Alphys- Light orange
Sans-Blue
Papyrus-Orange
Undyne- Navy
Mettaton EX- Pink
Gaster (Standard form)- Gray
Toriel-Purple
Omega Asriel/Hyperdeath- Dark green
Asgore- Yellow
Specimen-000- Light gray
Gaster/Void (battle form)- Monochrome gradient
Angel of Death- Rainbow Spectrum
Omega Flowey-Basic colouration

Other notes:
Specimen 000 usually is a lot smaller, but the form shown is the 'true form'.
Genocide is roughly smaller than the Angel of Death Asriel.
Gaster's 50% Void form and 'Companion' Form are not importatr, so they're not included.
Chara is a little taller than Frisk, but they appear to be same height.
Void is shown in his largest form, but he can shrink down at will.

*** Some characters are bent down, appearing shorter. They are in order of full height.