you can't
There're no dark chip in MGM BTNW6
you can't. Dark aura can only be gotten in megaman battle network 3 BLUE. You get it by doing all the time trials in secret net. In WHITE, you get the Serenade chip.
Only in Blue, and a reward for successfully completing the Serenade Time Trials. These will be available after you defeat Serenade.
Life Aura can be found on the Scuttle viruses in the Secret Area (repels attacks < 200 dmg), and Dark Aura is not available in White. I believe Dream Aura is a combo, not a chip (Dark Aura + Sanctuary, maybe?).
people with heads
No.
When megaman becomes worried (which happens after he gets hit a bunch of times without returning any damage) darkchips will appear in the custom window. Though you have to own them, obviously, for them to show up.
I don't know if there are any, but other character modifiers exist. With a little tinkering, you might be able to create one that makes Megaman take the form of Darkmega.
dark anubis,blackwing,element dark,and i think static and hole
In MegaMan Battle Network 3, "Where Evil Falls" is the location known as the "Undernet." This area is a dark, digital space filled with viruses and malevolent programs. Players navigate through various regions of the Undernet, battling foes and uncovering the story's deeper conflicts. It's a key setting for key plot developments and encounters with villains.
DarkMan is located in Secret Area 1 and is available only after Alpha has been defeated. You may need the hammer from Undernet 7 to reach his door; if not, it's still a pretty handy item to have. To open his door, you will need 140 standard chips, whether you like that or not, so get jiggy with it.
Assuming u know how to get to the lower area of Undernet2, see the 2 dark navis looking to the right side of the screen? Just follow in an invisible path till u reach the Moonstone.