I thought they were a Successor Chapter of Lion El Johnson. Because of the Lion motif (and the fact Dark Angels wear "Dresses").
Perhaps, it was Vulkan's and his Legion's commonly known affection towards ordinary citizens of the Imperium that prompted me to associate Salamanders with cuteness
I wonder how have Mechanicum managed to hide their forges on Mars? I mean, current space shuttles and robots roaming Red Planet's surface find no trace of civilization or structures yet we know that Mechanicum is there - how so?