A powerful dragon digimon with six floating hands, capable of attacking enemies from multiple angles.
What does her lower form twins that makes her looks like?
Are they both like sisters or are they like brother and sister like?
They aren't siblings in the usual sense. One is a digimon, and one is a familiar that became her own digimon. I won't get into the details now.
If you're asking what forms create the appearance of this form, I should say that Ihadramon is actually a super mega of sorts. I only said mega for simplicity sake. The forms used to make this are HyldenImpmon https://www.weasyl.com/submission/251729/hyldenimpmon and Galaclivamon https://www.weasyl.com/submission/803332/galaclivamon-again .
Even though HyldenImpmon was the familiar, she is the dominant one in terms of relative appearance in Ihadramon.
Link
MzDragonKmak
Is he a Champion Level?