Personality

In his youth and now, Obito was constantly late, which more often than not, was due to the good deeds he had stopped to do, which usually had to do with aiding the elderly. Having made it a point in his life to do so, he noted that he knew all the elderly persons in Konoha, stopped once on his way to the Chūnin Exams to help an elderly woman carry her luggage. Obito was also easily moved to tears, which he always insisted was because he had gotten something in his eyes despite wearing goggles. Obito was in love with Rin; but his feelings were not mutual as Rin was attracted to Kakashi instead. Obito was frustrated by this, and envied Kakashi's prodigious skills, and so constantly sought to surpass him. Although these efforts usually ended in failure, he was able to spend time with Rin while she treated his injuries. Ultimately, Obito would never get the chance to reveal his feelings to Rin before his "death".

Abilities
Obito was fairly skilled as a child and was able to become a chūnin at the age of 11. He was able to be recognised as an adult in his clan, having mastered the Fire Release: Great Fireball Technique, though he had yet to awaken his Sharingan. He was a fast learner and also had very fast reaction time and reflexes, as he was able to incinerate a trap that was sprung on his team, though this was not always a good thing as seen when he pre-empted Might Guy's attack as a child but got knocked out instead. As an adult, having been trained personally by Madara Uchiha, who passed on most of his skills and knowledge to the young Uchiha, Obito's abilities have developed immensely easily allowing him to hold his own against both Kage-level and S-ranked shinobi.

After his right half was reconstructed from the DNA material of Hashirama Senju, Obito was granted an immense increase in vitality and chakra reserves.
Although, he hasn't been seen using the Rinnegan, its believed he has the same techinques and prowess as Nagato, he was able to master all five basic nature transformations.