Can you analyze the following text, in particular the personality of the two kids?

On the background of a snow-covered valley, two children stood in front of a mountain. You could not have found a better place for skiing, an activity the two brats preferred. Moreover, it was their birthday, so they were allowed to spend the whole day having fun. 
«He who arrives last is a rotten fish!» said the boy in the blue coat, as he began his ski descent. 
«When I get there, you'll be the rotten fish, Aedostul!» replied the other, who was wearing a bright orange coat. 
«Ooh, listen to you! Be careful not to melt the snow with that thing you're wearing, dear Stullenbird!» 
The boy in blue was visibly ahead, but both were skiing with absolutely perfect fluidity and agility. They seemed to be in their natural habitat. 
They were skiing downhill zigzagging, curving, even looking for ledges, from which to make jumps. Once again, they seemed to have properly tamed their surroundings. 
«I'm going to win anyway, Stullenbird!» the child in blue said. 
«Yes, but only because you left early, Aedostul! That doesn't count!» 
There was someone with the two children: the person who was supervising them. She was a well-hooded woman, who looked horrified and terrified at the two's performance. 
«Stop! Stop immediately! This is too dangerous! You're going to get hurt! Come on, get down boys!» 
Both children blew a raspberry at the woman, who reacted with a grimace of profound indignation. 
They faced a rather difficult and tight curve, but managed to ride it with great agility. They shouted a noisy "WHOO-HOO!" 
The speed was increasing at a rapid pace, along with the steepness. The last obstacle was a sort of uphill "rock" covered in snow. The two of them, thanks to their speed, jumped over it and were literally thrown through the air, both ending up, at different times, on the ground. 
It was actually not a good landing, but they both had a lot of fun. Stullenbird's ski came off his foot, while Aedostul lost both his rackets. «And it's one-nil to Aedostul!» he said happily.
PUAFF.
Immediately, his face got covered in snow.
«Here's your prize! A snowball, you cheater!»
"This is a declaration of war, Stullenbird!» 
At that point, they started throwing snowballs at each other, until their clothes were filled with white. 
«There you are!» the overseer coming said. «You two, Nivor twins! You are in trouble!» 
Without saying a word, the two brothers exchanged a knowing look, almost a bratty smile hinting at their intentions. 
PUAFF, PUAFF! 
The twins started bombarding their instructor with snowballs. She had no choice but to flee. Then, satisfied with their accomplishment, they laughed at the silly scene they had witnessed. At last, as to end on a high note, they laid down in the snow next to each other. 
They began to talk about the friendship they shared. They were happy. *** *** *** 
The structure that housed them was a small base at the foothills of the mountains, in a place where avalanches could not reach. There was a large space at the back, where they used to spend all their time playing and inventing new imaginative things with their friends. 
They often played soldiers, pretending to shoot with guns made of paper. Aedostul was better at this game, although Stullenbird always knew how to make himself unpredictable. 
«Taking care of those two is pure hell,» their instructor told another colleague. «In no time at all, they take all my life energy.» 
«They're twin brothers,» the colleague said. «It's only natural that they'd be in competition with each other.» 
«I wonder if they'll grow up and get along so well. Those two together are dangerous.» 
The woman, however, had already stopped paying attention to her colleague. 
«Stullenbird, Aedostul, leave those plants alone! Woe betide you if I find even a speck of soil lying around!» 
The twins took off running. 
«It is really impossible to deal with those two boys. They always find a mess to make» 
«Yet I think they are destined to do great things one day. It's written in their future» 
«Yes, I know. They have immense potential. Too bad that right now they only use that potential to create confusion» 
At meal times, the twins always used to seat side by side. No matter how hard the instructors tried to pull them apart, they were inseparable in every sense of the word. 
With them around, every meal almost always ended up turning into a food fight, where they used their spoons as slingshots to throw all sorts of food at each other. This time was different, as their favorite dishes had been prepared for the occasion: mushroom fettuccine for Stullenbird and salmon penne for Aedostul. 
«Are we already 9 years old?» Stullenbird asked to his brother. «No, we'll turn them at midnight,» Aedostul replied.
«Why at midnight? It's not like we were born at that time» «It's one of those things that adults do» 
«I hope they don't sing us that nasty little song» 
«Really! That would be super-duper embarrassing!» 
The twins began talking about many other things. *** *** *** 
Then they spent the rest of the afternoon playing video games. 
The formula was always the same: they would sit on the floor in front of the console with the controllers in their hands and stare at the screen. As long as they were playing, the world could have fallen, they would not have noticed anything. Everything was put in the background. 
At that moment, they were playing a classic car racing game. Of course, for them the competition was at its peak. Both were aiming for victory, even if they often ended their matches in draws. Anyway, they used to get the highest scores among all the players in the base. 
That day, they also managed to make an usual trouble of theirs. Stullenbird was peeing in the toilet, when suddenly Aedostul bursted in with a giant fish —at least compared to the two kids. He had stolen it from the canteen freezer. 
«Look, Stullenbird, I found someone who likes you!» said Aedostul, as he manipulated the poor fish's lips. 
«Where did you even get that thing?» 
«He wants to get with you! Look!» and always moving the fish's mouth with his fingers, he "made" it say yes. 
Then Aedostul threw the fish to Stullenbird, who having good coordination, caught it on the fly. Then he threw it back at Aedostul, and that's when they started playing catch... with a cod. 
After a dozen shots, the fish slipped from Stullenbird's hands and plummeted straight into the toilet. 
«What do we do now?» he asked his brother.
«Take it easy» said Aedostul calmly, «It will go away,» and he flushed. 
But the fish did not go away. On the contrary, the water rose to the surface and the fish remained clogged in the pipe. 
At that point, the two of them ran out of the bathroom before anyone discovered what they had done. 
Over the course of the day, they were terrified that someone would discover the trouble they had made. Fortunately, however, everything went smoothly. As a consequence, they finally concluded that the fish had gone into the pipes. 
At nine o'clock in the evening, however things suddenly changed. They had just finished their dinner, and were waiting for the cake, when an instructor approached them with a heavy step and an angry look. 
«YOU TWO!» he yelled. «Who’s been? One of you has clogged the toilet bowl with a sea bass! Who?» 
They pointed at each other. «Him!». «Him!» they said with one voice. «What did they do!?» asked the woman 
«I have just noticed that the toilet was clogged. I looked closer, and there was a fish tail under there! Crazy stuff!» 
«You need to compliment the cleaners and tell them that fish grew in the toilet,» Stullenbird muttered. 
«DOES THAT SOUND LIKE FUN TO YOU?» the woman screamed. 
Luckily for them, it was their birthday, so that they were not punished for their stunt. The incident was glossed over, and the adults made an effort to see the comical side of the situation. 
Finally, the cake arrived, and the two blew out the candles together. It had been an absolutely wonderful double birthday. 

