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Jiang Yanggu is a planeswalker boy from the Plane of Mountains and Seas, who is always accompanied by a sapient dog named Mowu.

Appearance and characteristics
He has power over the creatures of the forest, and can magically enhance their strength. Jiang is able to planeswalk with his dog as part of his planeswalking ability.

Jiang Yanggu is centered in green mana.

Origin
After waking up with no memories, he didn't know his name or family. He renamed himself Yanggu (literally "valley where sun rises" ) after the Easternmost Valley of his home country. To save the Jiuli Clan, which was haunted by plague, Yanggu ventured into the Ten Wizards Mountain for a solution. Here he battled, and later befriended, the mysterious water mage Mu Yanling. With Yanling's help, Yanggu tackled the threat of the plague. In order to find out who he really was, he went onto the journey of expedition with Mu Yanling.

War of the Spark
Jiang Yanggu and Mu Yanling were lured to Ravnica by the Interplanar Beacon, and immediately became trapped there due to Bolas's use of the Immortal Sun. Alongside many other planeswalkers and Ravnicans, he fought against the Eternals of Bolas' Dreadhorde.

During the invasion, the trapped planeswalkers got together with Ravnican leaders to strategize. At Jace's recommendation, they decided to split up into teams to focus on specific tasks. Ajani, Huatli, Jiang Yanggu, and Mu Yanling volunteered to help protect and rescue civilians. With the help of Vraska and the Golgari Swarm, they were able to evacuate many civilians to the tunnels beneath the city, where they would be safe from the Dreadhorde.

Yanggu was one of the few planeswalkers who chose to remain on Ravnica after Chandra disabled the Immortal Sun, helping the Gatewatch in their fight against Bolas. He and Yanling survived the battle, and they were among the first planeswalkers to leave Ravnica after Bolas' defeat, with Mowu turning into a stone statue before both he and Yanggu disappeared.

Planeswalkers met
• Ajani Goldmane

• Gideon Jura

• Huatli

• Kaya

• Khazi

• Mu Yanling

• Ral Zarek

• Vraska

Planes visited

 * Plane of Mountains and Seas
 * Ravnica

Trivia
In the D&D campaign released with Dungeons & Dragons: Adventures in the Forgotten Realms, Yanggu was given a character sheet representing him as a druid, a spellcaster attuned with nature and animals. His sheet includes Mowu as a "mastiff", although it does not include any statistics or special abilities for the dog. Their alignment is Neutral Good, indicating generally heroic natures. His spells and abilities include a heavy focus on animal friendship, although none that specifically replicate the canonical character's unique connection to Mowu. As a nod to Mowu's size-changing ability, Yanggu has the "Enlarge/Reduce" spell.