Zomg, Mijumaru and Piplup do/don't look like each other so much/not at all. Let's argue with each other until people agree/stop posting on the forum.
But really. Tis a bit silly, no? Yes. Mijumaru and Piplup do has many similarities. Much in the same way that Pikachu and Plusle/Minum do. And Charizard and Dragonite. And Milotic and Dragonaire. And Feebus and Magikarp. And Venomoth, Butterfree, Beautifly, Dustox, and Mothim.
Dang. There are so many PokeMon that look like their designs have things in common... almost like how so many animals share similarities between species, such as cows and waterbuffalo and other various herding, hoofed animals. And don't even get me started on all those fish... And cats. Dang.
Personally, I don't think it's a big enough deal to be so vehement and irritable about.
Anyway... I would be quite interested in seeing a Ground/Fighting or Dark/Fighting type, after looking at that chart. There were a few others that seemed cool as well, but those stuck out.