Often, people consider Danzo as the successor of Tobirama Senju. Yes in fact, they share some common traits, like "the end justifies the means". But that's all. In reality, Danzo despised Tobirama Senju as he despised all Hokage following Hashirama's path.
And especially because Tobirama humiliated him during the 1st Ninja War and appointed his rival, Hiruzen, as 3rd Hokage. In facts, the successor of Tobirama is Hiruzen, even though Hiruzen is a lot softer than him. But it is clear that Hiruzen is the successor of Hashirama and Tobirama.
Paradoxally, Danzo shared Madara's path, even though he was responsible of the Uchiha massacre. I am comparing him with Madara when he was still a ninja from Konoha. Hashirama and Madara, both were candidates to become the 1st Hokage, their point of view were diametrically opposed about how Konoha should be. If Madara became the 1st Hokage, Konoha as we know today, wouldn't be the same. It would be a different village.
Madara left Konoha, but his inheritage didn't disapear. Danzo was the one who took over Madara's way (Konohian Madara). And this is mainly why Tobirama didn't chose him as 3rd Hokage, aside his selfishness, Tobirama also probably saw the shadow of Madara over Danzo.
1. Both acted under the Hokage's back :
Before the 1st Great Ninja War, Madara attacked Mu and Onoki while Hashirama wasn't aware of that. He believed it was for the sake of Konoha.
Danzo did exactly the same things, he acted several times under Hiruzen's back, for example during the 2nd Great Ninja War he allied himself with Hanzo to counter the former Akatsuki.
2. Both used force as only way to deal with other :
While for example the 1st Hokage tried to promote peace between the 5 great villages
Or the 2nd Hokage tried to conclude an alliance with Kumo
Madara wanted to impose Konoha's power over the world. He wanted to submit every nation under Konoha's power.
"There is no alliance. From here on, you will obey the leaf !"
Same thing for Danzo, he believed in Konoha supremacy over the world. And was angry when Hiruzen agreed on a peace accord with Kumo and Iwa.
3. Peace only by force
Both wanted peace, but a different peace than Hashirama's or Naruto's.
It is implied that, contrary to Hashirama, Madara as 1st Hokage would have kept the 9 bijuus caught by Hashirama, and used the superpower of Konoha to impose a New World Order in which Konoha will be the center, from this point of view, the peace is guaranted because of Konoha's supreme authority.
This was exactly Danzo's plan when he decided to become the 6th Hokage. His plan was to use Shisui's genjutsu to manipulate Mifune, then be appointed as the leader of the Shinobi alliance, making him as the leader of the world. Then we can assume that Danzo would have tried during the 4th Great Ninja War to weaken the other villages and make sure Konoha is preserved from the war casualties, finally making Konoha as the world superpower as Madara dreamed.
4. Both were hungry of power
Madara and Danzo didn't have any ethics, all was good to increase their power, and they always felt the need to increase their power.
Madara took Izuna's eyes, then he took Hashirama's cells, then he became the jinchuriki of Juubi.
Danzo took Shisui's eyes, then he took Hashiramas's celles, then he took 10 sharingan.
Madara created White Zetsu. Danzo ordered the creation of Yamato.
And especially because Tobirama humiliated him during the 1st Ninja War and appointed his rival, Hiruzen, as 3rd Hokage. In facts, the successor of Tobirama is Hiruzen, even though Hiruzen is a lot softer than him. But it is clear that Hiruzen is the successor of Hashirama and Tobirama.
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Paradoxally, Danzo shared Madara's path, even though he was responsible of the Uchiha massacre. I am comparing him with Madara when he was still a ninja from Konoha. Hashirama and Madara, both were candidates to become the 1st Hokage, their point of view were diametrically opposed about how Konoha should be. If Madara became the 1st Hokage, Konoha as we know today, wouldn't be the same. It would be a different village.
Madara left Konoha, but his inheritage didn't disapear. Danzo was the one who took over Madara's way (Konohian Madara). And this is mainly why Tobirama didn't chose him as 3rd Hokage, aside his selfishness, Tobirama also probably saw the shadow of Madara over Danzo.
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1. Both acted under the Hokage's back :
Before the 1st Great Ninja War, Madara attacked Mu and Onoki while Hashirama wasn't aware of that. He believed it was for the sake of Konoha.
You must be registered for see images
Danzo did exactly the same things, he acted several times under Hiruzen's back, for example during the 2nd Great Ninja War he allied himself with Hanzo to counter the former Akatsuki.
You must be registered for see images
2. Both used force as only way to deal with other :
While for example the 1st Hokage tried to promote peace between the 5 great villages
You must be registered for see images
Or the 2nd Hokage tried to conclude an alliance with Kumo
You must be registered for see images
Madara wanted to impose Konoha's power over the world. He wanted to submit every nation under Konoha's power.
You must be registered for see images
"There is no alliance. From here on, you will obey the leaf !"
Same thing for Danzo, he believed in Konoha supremacy over the world. And was angry when Hiruzen agreed on a peace accord with Kumo and Iwa.
You must be registered for see medias
3. Peace only by force
Both wanted peace, but a different peace than Hashirama's or Naruto's.
It is implied that, contrary to Hashirama, Madara as 1st Hokage would have kept the 9 bijuus caught by Hashirama, and used the superpower of Konoha to impose a New World Order in which Konoha will be the center, from this point of view, the peace is guaranted because of Konoha's supreme authority.
This was exactly Danzo's plan when he decided to become the 6th Hokage. His plan was to use Shisui's genjutsu to manipulate Mifune, then be appointed as the leader of the Shinobi alliance, making him as the leader of the world. Then we can assume that Danzo would have tried during the 4th Great Ninja War to weaken the other villages and make sure Konoha is preserved from the war casualties, finally making Konoha as the world superpower as Madara dreamed.
You must be registered for see images
4. Both were hungry of power
Madara and Danzo didn't have any ethics, all was good to increase their power, and they always felt the need to increase their power.
Madara took Izuna's eyes, then he took Hashirama's cells, then he became the jinchuriki of Juubi.
Danzo took Shisui's eyes, then he took Hashiramas's celles, then he took 10 sharingan.
Madara created White Zetsu. Danzo ordered the creation of Yamato.