BB Senshi Sangokuden is a toyline created by Bandai, commemorating the 20th anniversary of SD Gundams, and ongoing from 2007 to 2011.A continuation of the long-running BB Senshi line of SD Gundam models, this series also draws upon Romance of the Three Kingdoms for its characters, whose designs are all based on classic Gundam models from the Universal Century to the semi-recent Gundam Wing and G Gundam. So far, the story has been divided into three chapters: Fuuun Gouketsu Hen, Eiyuu Gekitotsu Hen and Senjin Kettou Hen. Expanding on this is the sidestory Sangokuden Gaiden: Buyou Gekitou Roku, and now an Animated Adaptation, SD Gundam Sangokuden Brave Battle Warriors, which currently airs after Keroro Gunsou.Note: This article uses the Japanese version of Romance of the Three Kingdoms, and as such "Cao Cao" = "Sousou", "Liu Bei" = "Ryuubi", "Sun Quan" = "Sonken".
BB Senshi Sangokuden provides examples of the following tropes:
Amplified Animal Aptitude: The horses of the Nanban Kibatai are bred and trained to traverse the implausible terrain of the untamed Southern regions.
Anachronism Stew: Ignoring the whole robot angle for a second, you've got characters armed with swords, spears, polearms mostly, and bows and throwing blades for ranged combat, alongside machine guns, BFGs, mobile artillery... there's also Sekitoba turning into a motorcycle, Kannei's jetski, the list goes on.
Brick Joke: Reactions over one of Ryubi Gundam's twin katanas being "forgotten" for the anime were mixed, but the anime's final arc even goes on to omit one of the twin Phoenix swords that Sousou Gundam gets.
Butt Monkey: Chouhi is pretty much theButt Monkey around these parts. Though in Brave Battle Warriors, Sonken Dendrobium is openly mocked by pretty much everybody, since he has yet to level up.
Camp Gay: The Chou Trio, who speak with overly effeminate overtones and in Brave Battle Warriors, have body language to match.
Combining Mecha: from the (heavily reimagined) Yellow Turban brothers to Shuu Neue Ziel with the Black Gyokuji and three sons of Shiba-I.
Conspicuous CG: Brave Battle Warriors mixes cel shaded CGI characters (usually leading ones) with normally animated ones, leading instantly to speculation that anyone not in CGI is not getting a model kit made. Jossed with Toutaku Zaku, who did eventually get his own CG model for the last couple episodes he appeared in. Kanpei Gundam turns from cel to CGI in his debut episode.
Cool Horse: Practically everyone, at least implied so.
Ryofu Tallgeese has the Sekitoba, which turns into a bike.
The anime introduces Sousou's Zetsuei, a sharp, jet black affair.
Cool Shades: Kan-U Gundam, Sonken Gundam, Sosaku Physalis and Sonken Zephyrantes actually have these incorporated into their design. The Shuuyu Hyakushiki model includes an alternate sticker for the eyes intended to invoke this.
Historical Beauty Update: This may be the only Three Kingdoms adaptation that DOESN'T depict Zhang Fei and Meng Huo as The Big Guy Boisterous Bruisers. And Dong Zhuo is above average in size but NOT fat.
Homage: The characters (and some MacGuffins) draw their design not only from classic Gundams, but Koei's treatment of the Three Kingdoms characters in all their Dynasty Warriors games. Lu Bu's pheasant feathers? Ryofu Tallgeese has 'em. Ma Chao's wild hair? Bachou Blue Destiny has ARTICULATED hair. Sun Ce's giant tonfa? Wait till you see what Sonsaku Physalis' shoulder boosters double up as.
Hour of Power: The Five Shou Generals experience this with the Ryuukihou.
The anime does something similar after Tengyokugai is awakened and a brief Time Skip is invoked - our heroes use the time to upgrade into Ryousou (Dragon-Armor) Ryubi, Ogasou (Demon Tusk-Armor) Kan-U, Raisou (Thunder-Armor) Chouhi, Gurensou (Red-Mantle) Sousou and Mokousou (Tiger-Armor) Sonken. All this is placed chronologically before the ones stated above.
Glaringly obvious with the three factions' footsoldiers, all based on the RX-79 GM and only differentiated by color.
Among the named characters, there's Gien Gundam, identical to Kochu Gundam but based on the 'Titans' recolor into which their archetype, the RX-178, was also recolored.
Shiba-I Sazabi goes through one for his promotion to Giga Taifu, particularly notable as he gets recolored INTO the Sazabi's normal colors (white to red).
This happens more often with the merchandise of course - not just straight recolors, but the Kanpei Gundam and Shuusou Doven Wolf sets include recolored Ryuubi parts.
Plug 'n' Play Technology: several cases thanks to the model kits' interchangeability. The Ankoku Gyokuji in particular is capable of combining with different characters to become Expies of One-Winged Angel-class mecha from different Gundam continuities.
Particularly the Ryukihou whether it's on Shuuretsutei Ryubi or the Five Shou Generals. The Brave battle Warriors version of Shuuretsutei Ryubi has the added option of swapping his regular shoulderpieces (Kan-U and Chouhi's) with all the ones the other Five Generals would use.