Ok, after documenting every hero I have found in a wild, here is a complete list of Intermediate, Senior & Legend Heroes.
There are many Junior heroes, but the more I document their stats, the more I find that Junior Hero stats are always different

Intelligence on all heroes ranges from 10-50. Command on all heroes is 10 at level 0.

All stats are for level 0 hero.

Junior Hero stats:
80-204 Attack
80-200 Defense
35-58 Speed
80-130 Load
7-50 Flex