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'''Julio Santana''' (Japanese version: {{nihongo|Julio|ジュリオ|Jurio}}) is a character in ''[[Bakugan Battle Brawlers]]''. He is the fourth-ranked Bakugan brawler and best [[Haos#LegacyGeneration 1|Haos]] brawler in the world at the start of the series. Along with many of the other [[The Top Brawlers|top brawlers]], he was brainwashed into becoming [[Naga]]'s servant. As a result, he fights against the [[Battle Brawlers]] a few times before being freed, after which he aids the Brawlers in their quest to defeat Naga.

Julio is a [[Haos#LegacyGeneration 1|Haos]] battler and his [[Partner Bakugan]] is Haos [[Tentaclear]]. Julio was the [[The Top Brawlers|fourth ranked Bakugan player]] until [[Masquerade]] defeated him. He is presumed to live somewhere in Europe. He is also shown to have a strong rivalry with [[Runo Misaki]] for being the best Haos brawler. He also sometimes gets called "Cue Ball" by Runo.

Julio, along with other Top Brawlers in the world comes to a "party" created by [[Masquerade]], it is there where he is sent to the [[Silent Core]] and put under the control of [[Naga]]. When Julio is under the control of Naga, he fights against [[Runo]] and [[DanKuso]], and ends up losing although he sends four of their Bakugan to the [[Doom Dimension]]. After that defeat, he fights Dan, Runo and [[MaruchoMarukura]] in one final battle alongside [[Chan Lee]] and [[Klaus von Hertzon]], but loses again and is freed from Naga's control. Julio is next seen when Masquerade defeats him and sends Tentaclear to the Doom Dimension.

He chooses to stall [[Tricloid]] when Naga's minions invade Earth. He reappears to help the Brawlers fight Naga's forces when he battles [[Hairadee]] alongside [[KombaO'Charlie]] and [[ShunKazami]].

In ''[[Duel in the Dunes]]'', Julio makes a cameo in the group picture taken back in Season 1 shown by [[Dan]].

*[[Haos#LegacyGeneration 1|Haos]] [[Tentaclear]] ([[Partner Bakugan]])