So by my count there are 20 non-HOTM non-event (“normal”) 5* heroes
4 red 5* (Azlar Marjana Khagan Elena)
4 blue 5* (Isarnia Magni Thorne Richard)
4 green 5* (Kadilen Elkanen Horghall Lianna)
4 yellow 5* (Vivica Joon Justice Leonidas)
4 purple 5* (Sartana Quintus Obakan Domitia)
So we know that the odds of a legendary pull are 1.5% for a standard epic portal pull.
Is the chance of getting a specific normal legendary 5* hero, eg Vivica, 1/20 x 1.5%?
Is the chance equally split between all 20 “normal” legendaries or are some heroes harder to get than others?
Therefore, if we use the yellow elemental portal (which has 2.5% chance for a “normal” legendary pull), does the chance of pulling a particular hero eg Vivica now increase to 1/4 x 2.5%?