Hm... Well, For me, I have been with nightmare for just over three years. Also... Sabre is kinda my older brother... He tried to kill me under the control of our father. he was blinded into thinking I was the bad guy. I am the Goddess of darkness, death, shadows and the like. i can create things out of shadows, control people, send out waves of literal death, and fly/teleport/glitch. Also the tears. That started happening after dear old daddy killed my twin brother. It allowed a moment of weakness for a parasite of my fathers creation to infect and control me. I now have power over it, but my usual silver tears have turned black. Also, sabre has similar, that is why he also wears a blindfold.
I'll answer the other questions, as the people you tried to contact are not available at the moment.
For the demonic twins, Negative does indeed have a crush on Illusion. Well... they are 'secretly' dating, but everyone can tell. Positives favourite hobby is baking cookies with his boyfriend, Ghost.
Everyone who is in my group has, in some way, succumbed to weakness, allowing that to be exploited. That is probably everyones worst trait. But their best trait is the everlasting kindness, even in Hypnoses. You remember how he helped rainbow, Right?
My favourite member of the crew is definitely Nightmare, though time is a close second. The funniest moment hasn't actually been written yet, but it's a bit later in the MHA story. My sister secretly sneaked into my bag. She then came out in front of everyone. She is a fox.
My biggest fear is what happened to me and my brother ever happening to anyone else, or if my father ever takes over the whole multiverse.