It's a slow change, about 3 seconds. Also, when he's changing he glows the color of his shirt slightly and exudes mist, so if people pay attention he is extremely noticable.

Okay.... How many times a day can he do this? For how long each time?

Hmmm........well, I would believe he could do this about 10 times a day, for about 5 minutes long each time at the most......seeing as he mainly does this to learn some info quickly or assasinate someone.

Name: Gru Dalokohs
Age: 13
Gender: Male
Eyes: Blue
Hair: Brown and long, usually with a red headband around them. Somewhat shaggy.
Height: 5' 5"
Body Type: he's somewhat fat, with wide arms, slightly under normal legs, and normal feet. His head is normal too.
Skin Color: Caucasian
God Parent: Ares
Mortal Parent: Sasha Dalokohs
Country of Origin: Russia/USSR
Pets: A golden retriever named Brass Beast
Talents: He's extremely strong, he can sing sort of nicely, and he has good stanima
Weapon**: When fighting fellow demigods, he uses his bare fists and hands, when fighting monsters, he uses celestial bronze boxing gloves
Flaws: His grammar is......quite poor, he has a compulsive eating disorder, and he is really slow
Powers(must relate to god parent; optional): None
Life Before CHB*: Gru was one of those kids who you knew was weird but knew you'd get destroyed if you teased him for it. His mother was one of the best chefs in his home city of St. Petersburg, and so he became somewhat fat due to eating. He, however, didn't let this go to his head, for he was one of the strongest kids in the wrestling club at school. One day, he moved to America so that his mom could get even more money. Once there, he learned he was a son of Ares and came to Camp Half-Blood to show his brothers and sisters that he's still got it, even if it means breaking some bones and learning better English.
RP Example*:I walk into the camp and look around. "Entire camp is babies!" I yell to nobody. I walk to the mess hall and look at the food. "Augh! Where did they go so wrong!" I say looking at bad food. I unwrap Sandwich and start eating. "Baloney perfect fuel for fighting tiny itty bitty little tiny bitty babies!" I say referring to the campers. I finish eating Sandvich. "That vas delicious," I say, walking to cabin.

Approved.

They're definitely going to see you try killing them, so...

Add another flaw.

Edited......

Approved.

Name:Robin Dowes
Age: 14
Gender: Male
Eyes: Green
Hair: Light brown and straight, with a little spike in the front
Height: 5'7"
Body Type: He's...normal? Like, not buff but not fat, not skinny but not thick.
Skin Color: Caucasian
God Parent: Freyr
Mortal Parent: Agathe Dowes
Country of Origin: America
Pets: A dove named Pythagoras
Talents: He can ride horses well, he's a good climber, and he tries his best at helping people
Weapon**: Celestial bronze spear
Flaws: He can be too narrow-minded when working at something, he can be too nice to the wrong people, and he gets depressed easily.
Powers(must relate to god parent; optional): He can make it rain in any section 5 by 5 feet in a 50 foot radius of him about.....5 times a day?
Life Before CHB*: Robin was a farmer for most of his early life, with his mom. He had a poor education (not like it would have helped him with his ADHD and dyslexia), but he was popular in the town he lived in. Sadly, the day before his arrival in Camp Half-Blood, his town got raided. His mom was severely injured, and since then he is easy to break down into sadness. However, he has tried his best to go over that and help anyone in need, even if it hurts his soul in the process.
RP Example*:I walked around the town, going to gather some fertilizer. While I did so, I saw what looked like a group of men, and they were angry. I watched them in hiding, and saw that they had axes, swords, and tons of weapons. I ran to go to tell the mayor, but it was too late. They started burning and killing everyone and everything on sight. I saw my mom get tossed aside, and I ran, off to find any place where I could stay safe now.