|Flaw: Calorie Crunch|
Circus burns is an athlete who works out long and hard each and every day and can burn a lot of calories. However, the energy requirements of her powers dwarf her already high caloric requirements. Simply using Showtime burns a lot of energy, and each time she uses one of her other powers she burns hundreds more. T teleporting has a serious 'calorie tax' each and every use.
Circus needs to eat 5K calories simply to maintain each day. She cannot access Showtime until she's reached this caloric plateau. On the average day she'll burn 5K more using her powers. If she pushes herself this number can go even higher.
Eating that much creates a lot of issues. It would take 8 big macs, 8 large fries, and 8 large sodas to give her the calories she needs on an average. But calories aren't enough, she has to be careful about nutrition as well as she seems to have higher requirements for certain vitamins and minerals. Eating healthy diet with the calories she needs is a task. It is expensive and time consuming. 9K Tour de France diet example: http://tiny.cc/gd20gw
If Circus pushes her limits too hard or too long and pushes too deep into her caloric reserves she can experience "Downtime". Downtime reverses her time experience ratio, and she experiences time on a 1 to 2 ratio, or even higher if she's really been pushing herself. The world whizzes past her in fast forward. To get out of Downtime she needs to eat several thousand calories to get her caloric furnace going again.
Flaw: High Time
Showtime is mood altering. It makes her happy. It makes her feel good. The longer she uses Showtime, the better she feels and the happier she gets. She gets giddy, silly, euphoric. Everything becomes fun and funny. Circus becomes oblivious to tragedy and risk and her inhibitions fade until they are practically non-existent. Her ability to make sound judgements diminishes. Her perception will begin to drop (Overload) and eventually even her motor skills begin crumbling. The effects don't instantly go away when she turns off her powers. They can take several hours to clear out of her system depending on just how effected she was.
Circus is far from perfect. She is not the ideal of heroic morality. She drinks, does recreational drugs from time to time (Though as her power addiction grows, Showtime is her drug of choice). She's not above taking cash from badguys if no one is looking, and she has often copped a night in a hotel or fancy condo when no one is home.
Some people might focus on this aspect of her activities rather than the crime fighting she does if they found out. The police tend to generally fall into that category. Many of her fellow heroes might as well.
Circus produces produces a great deal of body heat. When she's using her powers her temperature climbs. The more she uses, the quicker the climb. This can be dangerous at anytime, but it is particularly bad in high heat conditions where she can't cool down effectively. If she's in the danger zone she'll experience the standard effects of heat exhaustion such as dizziness and confusion. (Though her use of Showtime can easily mask those warning signs) If she gets into the red for too long, her body will overheat and initiate Shutdown.
Showtime boosts Circus' perception significantly. It will continue to increase as she uses. However, her brain will begin to stop being able to process this information effectively. Though in fact she's becoming even more perceptive, her ability to use that perception will steadily decrease over time. This sensitivity to stimulus makes her more susceptible to effects that target the senses. Powers that distract via sensory input will grow increasingly effective on her overtime.
Flaw: Power Addict
Circus likes using her powers. It is almost impossible to not like using her powers (See: High-Time). A little shot of Showtime can make any situation more fun. She constantly has the urge to power up, even when she doesn't need to. It isn't technically a drug, and it doesn't seem bad for her body really. If it wasn't for Up-Time and Down-Time she might just give in and live powered up 24/7. But she does have Up-Time and the even worse Down-Time to deal with. She knows she an addict, but that doesn't make not using any easier.
Flaw: Real Life
Real life sucks. Or maybe it is Circus who sucks at real life. She has a hard time keeping jobs, which leads to having a hard time paying bills. Basic necessities take a back seat to costumes, hero gadgets, etc. She lives in a house full of students and dancers where she sleeps on the floor out of the kindness of one of the girls. Most of them are aware that she's some sort of hero and most are more concerned with the fact that she owns a Volkswagen bus that she isn't afraid to drive in the city.
If Circus pushes herself too hard and burns too much of her energy reserves, she gets Downtime. If she reaches even farther and actually burns energy meant for her body, her body fights back and she hits "Shutdown". In order to protect itself from harm, her powers quickly begin to shutdown.
When she hits shutdown she is struck by a wall of fatigue. Her powers begin to shutdown and she only has a short time before she will collapse in exhaustion. After she has collapsed she will sleep the sleep of the dead for about a day. (If she managed to eat some serious calories before passing out this can be shortened somewhat) When she wakes up she will be groggy and disoriented until she has fully recovered from the energy deficit she put herself into.
After she's been actively using "Showtime" Circus is hyper and energized. She lives life in the fast lane while the after effects of her powers works themselves out of her system. This can take a couple hours or all day depending on how long she was using her abilities.
Being hyperactive isn't so bad as far as action is concerned, but it isn't so great for living a normal life. Circus has a hard time concentrating or listening. She is easily bored and is extremely susceptible to being distracted. She fidgets and has a hard time staying still for any length of time.