As I said, this will be random. And it'll have both facts and opinions.
Black Widow was trained by Wolverine.
This is when she was really young. He temporarily left his violent ways for her and cared very much about her well-being. I think it's pretty badass considering he's one of the best fighters in the Marvel universe.
She also once fell in love with Bucky Barnes while he was brainwashed (but she wasn't completely sane either back then).
Superman can run faster than Quicksilver (and fly much faster).
This is why I feel that most Flash vs. Quicksilver races are pointless. If Superman is that much faster, you can imagine how much faster Flash is.
All Marvel's site states about Quicksilver's speed is that he can travel faster than the speed of sound. This does make him one of the fastest characters on earth in the Marvel universe. But Superman's top speed is said to be around ten times the speed of light (assuming we don't count pre-crisis or DC One Million). I'm not sure about Wally's speed but Barry Allen's top speed is 13 billion times the speed of light.
Now Flash vs. Silver Surfer would be a much closer race but I still think Flash would win. Surfer's speed is estimated to be around 31.5 million times the speed of light. Marvel's fastest character is Makkari though. I've heard he's faster than the Flash but I know absolutely nothing about his character.
This is only in the comics though. I do think that Fox's Quicksilver is faster than CW's Flash.
Black Panther would beat Batman in a fight.
The short version
I'm just going to compare all of their attributes DnD style.
• Fighting Skill = Black Panther
• Strength = Black Panther
• Speed = Black Panther
• Will Power = Batman
• Durability = Black Panther
• Agility (reflexes, reaction time, nimbleness) = Black Panther
• Senses (hearing, vision, scent) = Black Panther
• Dexterity = Black Panther
• Comprehension = Black Panther
• Vitality = Black Panther
• Wealth/Resources = Black Panther
• Battle Tactics = Black Panther
Black Panther = 11 points
Batman = 1 point
The long version...
A lot of people do say that Black Panther is a Batman rip-off and I'm not denying that. He very well might be since the two characters are similar. That's exactly why he'd win though. They had a character to take ideas from so they could improve upon him and give him more.
To start off, Black Panther started training when he was a lot younger. He's been trained from the moment he was born. Batman knows 127 different martial arts but Black Panther knows literally every form of hand to hand combat known to man and many different forms of armed combat too. Even now, he prefers to train in the jungle with other creatures rather than his own cave.
He also grew up in the most technologically advanced country in the Marvel universe where they've been feeding him the right kind of food and herbs so he could be at the absolute peak of human potential and have better senses. So he's stronger, faster, more agile, and can sometimes recognize people by their scent alone.
This was before he was enhanced even further though. Unlike Batman, he does have powers. He's got a mystical connection with the Wakandan Panther God, which grants him superhumanly acute senses, enhanced strength, speed, agility, stamina, durability, healing, and reflexes. He's strong enough to stop the charge of an elephant.
He also has more than 6 times as much money. Bruce has $80 Billion but T'Challa has $500 Billion. For comparison, even Iron Man has $100 Billion. And considering he has his own army, he's more experienced with battle strategies too.
Finally, Black Panther has a contingency plan for Galactus who is more powerful than most of the Justice League members combined... Oh, and did I mention the next bit?
Black Panther once defeated and killed a T-Rex using equipment only found in the jungle. He used a palm tree as a catapult to launch a boulder at the beast.
Only Hawkeye can draw his bow.
The reason is that it's DNA-locked. The string is rigid and turns elastic when Hawkeye touches it. Thor's godlike strength would end up breaking the bow.
Thor and Hulk can survive in hotter temperatures than Superman.
This isn't only an assumption since they have the feats to prove it. All three of them have survived supernovas, but Superman got K.O.-ed by it and Hulk and Thor weren't even phased out.
This isn't entirely implying that the two of them are more durable since it depends on the kind of attack. Superman is definitely more durable against sharp objects since it's harder to penetrate his skin. He's also taken blows from much more powerful opponents.
He's the least durable among the three against energy attacks though. Thor and Hulk have better showings against explosions and they're not as easily affected by radiation. Thor is also immune to most forms of lightning.
Batman's always been more interesting as a solo character.
I've felt this way about majority of the comics that I've read involving him. I do enjoy some of the Justice League stories featuring him but I think his solo stories are a lot better. It's known that he doesn't play well with others and I really do think he works best when he's alone.
My favorite story featuring him is The Dark Knight Returns and even though Superman is in it, the story is more about Batman. I hated it's sequel The Dark Knight Strikes Again though. One of the reasons is that they tried to introduce many characters, but I can name so many things wrong with it.
Green Lantern and Wonder Woman were supposed to be a couple.
But that was scratched in the 70’s when DC received a letter by a fan that suggested the same idea. Due to legal reasons, this prohibited DC Comics from moving forward with the idea.
There's a comic where Superman is Batman
It's called Superman: Speeding Bullets. It's in an alternate universe where Kal-El's ship ends up in Gotham and he gets adopted by the Waynes. They name him Bruce and raise him. You can guess the rest.
He didn't use a grappling gun since he can fly and he also didn't need his ninja skills since he could use his speed to disappear. This story does a good job showing how different both the characters are. The Batman we see here is much darker though. Most of the supporting characters are Superman characters, besides Alfred. Tho story does take place in Gotham and I think that Dematteis did a really good job writing it.
Deadpool was originally written as a parody of Deathstroke.
A lot of fans have noted similarities between the characters, but Marvel has admitted that all of them are actually intentional. Even their names make it obvious... Wade Wilson and Slade Wilson.
They decided to keep Deadpool since fans loved him. He's developed into his own character now.