Wisetooth has a familiar look and shape. The hollow blade motif is a familiar one in fantasy, so it ends up looking slightly generic. Having said that I like the thickness and spiking on the end that gives a sense that the blade, while lightened due to its hollow nature, would still have a great deal of heft and momentum.
Nautilus looks a lot like the baby brother of the Soul Edge. I'm waiting for the jewel in the cross guard to swivel around and glare at me before the entire sword opens up and reveals what looks like blades to actually be the teeth of a bottomless maw.