Quote - I thought A4 just looked like a morph pack for V4, (is that actually what she is? I have'nt looked that hard) and so have only given her as much consideration as any other morph character.

Yup, that's essentially "all" she is. Of course, what you get is an ability to morph V4 so that she looks about 95% like Aiko3's body shape (realistic, default, styilized), morphs to give the features more anime/manga/cartoon looks (pointy chin, small nose, big eyes), and morphs to give her exaggerated anime/manga/cartoon style facial expressions. So essentialy what you have now is one figure with both the Vicky and Aiko base functionalities, which was a problem with the Mil3 figures. Aiko realistic looked very good, but was limited due to her expressions. Vicky could be morphed to look a bit anime, but couldn't do the expressions. Now we have one figure which works for both.

Before Aiko4 was released, i tried to do a real manga-style character for V4 using morphs, and believe me, it was very difficult, and wasn't pretty at all.

I suspect, also, that using Wardrobe Wizard 2 you can fairly easily adapt A3 clothing to fit A4, since they are essentially the same shape, the distortions shouldn't be serious.