I can only sign, what Andreas wrote above!
Just a clarification because of confusing names:
Gunze has a alcohol based acrylic series "Mr.Hobby - Aqueous Hobby Color", the color names starts with H, e.g H301.
Another Gunze series is "Mr.Color" solvent based acrylic paint, the names starts with C, e.g. C301
Mr.Paint sounds similar, but this is a complete different company from Slovakia:
https://mrpaint.sk/They sell different paint series, I really like the lacquer base "Mr.Paint" series, names like MRP-254 (and yes, there are some WWI colors)
The Aqua based ones are MRP-A001, but I haven't tried them.
For metal colors I think the reference are "Alclad II" paint series, they are fantastic.
I must admit that the smell of Alclads and Mr.Paints are heavy (some people refuse to use them because of that), but with a extraction unit this goes out of my window this is not a issue. But that solvents allow a easy handling and other advantages, which cannot be reached by water based acryls.
Compared the smell of Mr.Hobby is much less.
Cheers,
Frank