This is a theory Ive had after looking at Kabuto and Obito
Kabuto: Multiple times he has said that he was closest to the SO6P. Even knowing that Madara Uchiha was an edo. Obviously he doesnt have the sage's eyes, so that means he meant that he had the sage's body. And If you notice, he has horns. they're on a different place, but they are horns
Obito: As soon as he absorbed the Juubi, he took on a more serpentine appearance, with snake/dragon like skin. It seems like he's in his final form, and he still has that appearance. Also, its only on the half of his body made of Zetsu, which is derived from Hashirama, who is senju
In conclusion: The SO6P probably looks a bit like a snake, or more likely a dragon. Even if he doesnt look like that, he might posses Dragon/Snake Sage mode. Not saying the SO6P is an actual dragon >_>
Kabuto: Multiple times he has said that he was closest to the SO6P. Even knowing that Madara Uchiha was an edo. Obviously he doesnt have the sage's eyes, so that means he meant that he had the sage's body. And If you notice, he has horns. they're on a different place, but they are horns
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Obito: As soon as he absorbed the Juubi, he took on a more serpentine appearance, with snake/dragon like skin. It seems like he's in his final form, and he still has that appearance. Also, its only on the half of his body made of Zetsu, which is derived from Hashirama, who is senju
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In conclusion: The SO6P probably looks a bit like a snake, or more likely a dragon. Even if he doesnt look like that, he might posses Dragon/Snake Sage mode. Not saying the SO6P is an actual dragon >_>