X-SOLDIER
Harbinger O Great Justice
- AKA
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Tobi's personality fundamentally changed AFTER he took up the name "Uchiha Madara" when we first see his Sharingan. He's seen before somewhat acting this way during the attack on Konoha when he's leading others to believe that he's Madara, or other times when he's being serious. When he's being "Tobi" his persona is very different suggesting that there's more to him than just the names he's been hiding behind for achieving his goals.
I'm assuming that his rise as the leader of Akatsuki took place shortly after the REAL Madara died, hence the, "My power, Uchiha Madara's power." line. That gave Tobi the opportunity to take Madara's name and persona completely, which is why he doesn't swap back to his more jovial Tobi persona after this, as he's playing a role. As "Madara" he claimed to have given Nagato the Rinnegan. The REAL Madara Uchiha had clearly interacted with Nagato, (since he expected to be raised by Rinne Tensei and not Edo Tensei), so I'm assuming this is a part of Tobi attempting to play the role of "Madara" by claiming that he'd done the things that Madara had.
I don't see the difference in personality between the kid we saw in Kakashi Gaiden & the man who's leading the war being an issue, especially because of the changes that we've seen in characters like Gaara. In only 3 years he's gone from a murderous psychopath into someone who gave his life to save the village who tortured him. If Obito somehow survived his traumatic injury out in the battlefield in the middle of the war (assumedly by being healed by the First's DNA), and THEN had been under the guidance of the REAL Uchiha Madara for the last 20+ years, there's a very real possibility of his personality being VERY twisted from we saw when he was younger.
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I'm assuming that his rise as the leader of Akatsuki took place shortly after the REAL Madara died, hence the, "My power, Uchiha Madara's power." line. That gave Tobi the opportunity to take Madara's name and persona completely, which is why he doesn't swap back to his more jovial Tobi persona after this, as he's playing a role. As "Madara" he claimed to have given Nagato the Rinnegan. The REAL Madara Uchiha had clearly interacted with Nagato, (since he expected to be raised by Rinne Tensei and not Edo Tensei), so I'm assuming this is a part of Tobi attempting to play the role of "Madara" by claiming that he'd done the things that Madara had.
I don't see the difference in personality between the kid we saw in Kakashi Gaiden & the man who's leading the war being an issue, especially because of the changes that we've seen in characters like Gaara. In only 3 years he's gone from a murderous psychopath into someone who gave his life to save the village who tortured him. If Obito somehow survived his traumatic injury out in the battlefield in the middle of the war (assumedly by being healed by the First's DNA), and THEN had been under the guidance of the REAL Uchiha Madara for the last 20+ years, there's a very real possibility of his personality being VERY twisted from we saw when he was younger.
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