Man-Bat is actually another one of Batman's clumsy scientist friends who turned himself into some sort of giant were-bat in an experiment gone horribly wrong ( Batman has a smaller stable of clumsy scientist friends than Spider-Man, but every hero needs to have a few on call.). That's a little terrifying. The problem is his name. How many people, not having read this, would know who or what Man-Bat was?
If you look at the pattern of Batman's own name, you might think Man-Bat is a bat who dresses up as a man in order to strike terror into the hearts of criminals.
Or to follow the Spider-Man pattern, he would be a bat who was bitten by a radioactive man, gaining that man's powers. Or like Superman, he could be a bat who exhibits characteristics that could be described as man-like. In any case, his name clearly denotes him to be a bat originally, and the only thing that scares people about bats is getting pooped on or getting diseases.
Also, Man-Bat just sounds stupid.
Ways To Make Him More Threatening:
Obviously he'd be a little scarier if he called himself The Winged Horror or the Nightshrieker or something like that. It could turn out he was a bat bitten by a radioactive man, and you could just show him in silhouette, issuing orders to his henchmen in chilling tones of cold steel. The spell might be broken a little once he flies out the window to go eat insects out of the air, but you don't have to show that very often.
Prism is made of glass. This isn't compensated for by any other power because that is his power.
You got adamantium claws or super-strength? You might as well give up now, because this guy can split a beam of light into the colors of the rainbow. Sure, if you're Cyclops or something and your power is shooting laser beams, maybe this guy can fuck you over, but come on, he's vulnerable to punching. And falling. And bumping into things. And powerful sopranos.
Like many comic characters, Prism has multiple deaths on his record. One involved a losing battle with a wall and the other involved one of his many weaknesses, bullets.
One can only speculate as to the manner of his next death, but the smart money isn't on old age.
How to Make Him More Threatening:
There are many sturdier refractive materials such as Plexiglass or even diamonds. If they can't engineer some kind of scientific accident where he gets reinforced to become one of those, at the very least give him the ability to break off shards of himself and hurl them at people. Maybe nick an artery or something.
While blind in his two regular eyes, Philip Reardon, the Ten-Eyed Man, has eyes in the tips of all his fingers. Here' a tip, comic book writers: Not every tragic deformity is a superpower. Despite his disability, Philip is the kind of guy to make lemons from lemonade--not literally, because that would hurt like hell if you think about it--but figuratively, earnestly trying to parlay his physical defect into a career of supervillainy.
He has some very problematic weaknesses, such as being helpless when tricked into catching or touching something. A smart man in his position would train himself not to react when Batman blurts out, "Heads up!" or "Think quick!" and tosses something in his direction. But, this kind of subterfuge is beyond him.
The writers seem just as stumped as the next person when it comes to reasons why we should be afraid of him, and have unfortunately gone the lazy route of just having other characters hype up his threat. Look, Kyra Sedgwick's character in The Closer doesn't become charmingly quirky just because you have all the other characters say she is. And, Ten-Eyed Man is still not scary even if you have the prison guards lock his hands in a metal box for fear he will use his awesome seeing power to escape.
It's really mind-boggling how anyone could have expected this to be a real, serious supervillain. Everyone who's ever been in any kind of fight, or watched one, or heard of one, knows that you go for the eyes. The whole success of pepper spray is based on this idea. It's inexplicable how some writer's idea of a formidable villain was a guy with the most vulnerable parts of the body multiplied five times. Carry this to its logical conclusion, and you can expect to see Mr. Twenty Testicles in issues next month.
How To Make Him More Threatening:
Here's a list of things he could have on the ends of his fingers that would be more threatening than eyes: steel claws, laser guns, supermagnets, acid-spray nozzles, flame jets, soldering irons, grizzly bears, cigarettes, multicolored ribbons, Lee Press On Nails and Pez dispensers. Seriously, anything that isn't eyes would be an improvement.
The Chameleon's power is the ability to disguise himself as any person on earth-a power that could be quite impressive if coupled with a mind of average intelligence. Unfortunately as fate would have it, the Chameleon is apprently functionally retarded.
In his first appearance, he attempted to steal a two-part set of missile defense plans. He accomplishes this first part disguised as a scientist who's supposed to be working on the plans-so far, so good. He decides to steal the second set of plans, however, disguised as Spider-Man. That sounds logical until you realize that at that stage of the comics, the public thought Spider-Man was a menace to society (because the newspapers were smearing him, you see).
So the Chameleon, in order to commit a crime, disguised himself as a wanted criminal. Since he's done this with the intention of framing Spider-Man, he's also lured Spider-Man to the scene of the crime. So, he's basically arranged to have the police and an actual superhero on scene while he's committing this crime. Does he get away with it? What do you think?
The Chameleon also has the dubious distinction of having been defeated by both Mary Jane (with a baseball bat) and Peter Parker's elderly Aunt May.
On another side note, either that's a very slow-acting poison, or Aunt May has somehow been given fast-knitting superpowers. Not too farfetched, as Peter has actually given blood to her several times, and the characters have speculated about whether this would give her powers. Either way, someone is getting a really inappropriate baby blanket for Christmas.
How To Make Him More Threatening:
Well, we had some ideas, but honestly we just gave up after we heard about the following storyline. While it is abridged, this is, honest to God, an accurate, contextually correct summary of how the actual story went:
So, apparently it' too late for our advice, because they just had him come out of the closet and commit suicide on the same page.
That probably puts him beyond our help. Sorry we didn't get to you sooner, buddy.