Hello there, since Susanoo is important in this shitty story I decided to explain it with the best of my ability.
If you have any pictures for black/gray Susanoo please send them here!
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Susanoo is like a human warrior. Every Susanoo has appearance related to its user. There is a difference in color from a user to another which is present at every stage. As we move to the next stages of Susanoo the appearance is visible. Every Susanoo increases its size as the user gets more experience and gets accustomed to Susanoo.
There are 5 stages and each stage is powerful than previous.
Skeletal Susanoo [Click here for examples]:
In this stage the user start with a small ribcage and as he battles and gets more experienced he can make a skeletal upper body.
You can't make a lower body.
Humanoid Susanoo[Click Here for examples] :
When the user gets enough experience with the Susanoo he'll reach this stage and will be able to coat his Susanoo in skin/flesh and clothing which will of course gives more defense.
You can make a lower body in this stage.
Armored Susanoo[Click Here for Examples] :
When the user reaches this stage his Susanoo will get more defensive however this is not the special thing about this stage.
When the user fully activates his Armored Susanoo his Susanoo will gain a unique abilities unlike any other.
Lower body of this stage is not shown but I'll include it.
Complete/Perfect Susanoo [Click here for examples]:
When the user gets enough experience he'll be able to unlock the ultimate and final evolution of the Susanoo.
There isn't anything special about this stage other than the extra set of the Susanoo arms turns into wings so the user can use it to fly.
The Beyond Stage [Click here for example] :
This stage is unnatural and it's only temporary, in this stage the user can use the Susanoo as a container to store energy and use it or coat the Susanoo around other entities .
The first case is only shown by Sasuke Uchiha when he drained the Chakra out of the Tailed beasts and stored it in the Susanoo or when he stored Jugo's Sage Chakra in his Susanoo.
The Second case is shown by Madara Uchiha and Sasuke's Uchiha when they used Susanoo while standing on the nine tails.
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Every Susanoo has a special ability/trait unique to it :
(The english name of Susanoo:
{He with the ability to help by all means }
so it shapes itself however the user needs it to be)
Itachi's had two soul weapons.(Yata Mirror and the Sword of Totsuka )
Sasuke's Susanoo can infuse Amatrasu with its attacks.
Shisui's can release powerful needles out of its chest and can use fire release with it.
Kakashi/Obito's can infuse Kamui with Susanoo attacks.
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Similar traits :
Even though every Susanoo is uniquely different because it's the embodiment of the User's will there's some similarities :
1-Yasaka Beads : Through the use of Susanoo, the user is able to create the Yasaka Beads from any of its hands. Due to its structure, it acts in a similar manner to that of a shuriken when thrown by Susanoo. ( basically a big explosive shuriken)
[Yasaka Beads PICTURE]
2-The ability to manifest two extra arms.
3-Powerful offense and defense.
There's more but I listed those three :)