Let's give this a try..

[AlphaScythian]

Lol if hashi is confirmed with slug sage mode ima call him slug king Lol

 

[Xlad]

Your nicknames are epic, you make them all sound like legends or myths! Dark Titan and Forest Progenitor are my favorite, and I think that's the 2nd two-face on this thread.

Thanks, I was actually going to called Nagato "Fallen Orphan" and Obito "Angel of Despair" or something like that.

I couldn't find a nickname for Maddy until his Susanoo came across.

 

[Penguin]

Ebisu - The Forgotten

Jiraiya - The White Haired Perpetrating Penetrator

Tobirama - The Man who is always a hurtin for a squirten

 

[Tennis Robot]

Sai style: Synecdoche Naming Technique!!!!!!
Naruto: Scratched face
Sasuke: ***-got (hyphen so they don't censor me)
Sakura: Forehead
Ino: Damn!
Tsunade: DD
Tenten: Bitch
Choji: Buddha
Mei: DAMN!!!!
Gaara: Eyebrows
Akamaru: Dinner
Shino: Mortician
Orochimaru: Pedo
Kabuto: Pedo***
B: 2chainz
Itachi: G.O.A.T
Darui: Kakashi
Kakashi: Darui
Hinata: Who?
Karin: Bi
Kimimaro: Boner
Nagato: Ethiopian
Kisame: Jaws

 

[Takeshi Uzumaki]

Serious attempt:

Kisame: Land Shark of the Mist
Tobirama: Water God of the Leaf
Ramne guy: Top Ramen
Kiba: Wolf Tamer
Naruto: One man Army , Nine Tailed Sage,
TenTen: TenTen of 1000 tools
Obito: Untochable Shinobi
Madara: Undead Uchiha
Hashirama: Father Nature. Lol
Sasuke: The Uchiha clan's Black Flame
KillerBee: ......Killer B. Lol
Raikage: The Cloud's Lighting Bolt
Shino: Beetle Boy
Hinata: Naruto's Wifey. "That would strike fear into anyone" lol

 

[paratise]

Sasori-pinoqio
Kimimaro-wonder boner
gaara-sandman [insert enter sandman from meatallica here]
so6p-pimp'o sixx hoez
Hashirama-mr morning wood
Madara-mr the one who took the morning wood
Sasuke-Sauce
Minato-goldilocks
Kiba-Yamcha
Neji-Thunderbird[insert thunderbird from quite riot here]
Rock Lee-Hitmonlee
Mei-Iron Maiden