Knife number 3 is definitely a display item.
11" overall, and with a dangerously sharp 6 1/2" blade, this would made a nasty little weapon, but for the fact that the handle and sheath are plastic. Both look okay, despite the "we're not copying The Lord Of The Rings, honest" wizard-and-Elf motif on both and the amazingly bad faux plastic gemstone that adorns both sides of the sheath. The butt is metal, but the bolster is plastic, and whilst it does have a full length tang, it's so narrow it would make a pen look seriously overweight.
Oddly, the knife is very nicely balanced and would probably make for very accurate throwing, provided one could be confident that the handle would survive the impact.