Hua Tuo is the medic of the entire game! Thus it is fitting that they give him a syringe (albeit with s horrifyingly large needle) and let him have peach while he's at it.
Who is he:
His name has become synonymous with "Miracle Doctor" as he cured many strange sicknesses. Studies by historians said his medical techniques were hundreds of years ahead of his time. The Romance of Three Kingdoms story, however, deviates from history slightly and almost turns him into Super Doctor. Two prominent scenes showcase Hua Tuo's incredible healing powers: the first is his surgery on Guan Yu 关羽's arm and the second is his proposal to cure Cao Cao 曹操 of his migraine. Both of these scenarios will be described later in the "Additional info" section. Though his appearance in the story is brief, he carries significant impact. This effect is felt when Cao Cao regrets the death of Hua Tuo as his own son, Cao Chong 曹冲, becomes gravely ill. Without Hua Tuo's medical expertise, Cao Chong did not survive the illness.
Character ability 1: "Emergency Rescue 急救 (jí jiù)"
Outside of his turn, Hua Tuo can use any of his cards (on-hand or equipped) with the suit of "hearts" or "diamonds" as PEACH 桃.
Character ability 2: "Green Salve 青囊 (qīng náng)"
During the action phase, Hua Tuo can discard one on-hand card and allow any player to regain 1 unit of health. Limited to one use per turn.
Ability's relation to story:
"Emergency Rescue" could have some connection with him saving Guan Yu from the poison arrow. Though Guan Yu wasn't exactly on his deathbed yet, the wound was life-threatening and Hua Tuo did save him. "Green Salve", on the other hand, is very much linked to the story. Hua Tuo had with him a book of his works known as the "Book of the Green Salve 青囊书". This book contained numerous medical techniques of saving lives, but was destroyed when he died. Though not told in the story, the historical accounts mention that this book was burnt by Hua Tuo himself when the prison guard refused to accept it.
Additional info based on story:
1. Most famous achievement - Removing the poison from Guan Yu's arm. Guan Yu suffered a poison arrow wound on his arm in the battle at Fan Cheng 樊城之战. When Guan Yu returned to camp, Hua Tuo was sought to heal him. In order to do so, Hua Tuo had to operate on Guan Yu and scrape the poison from the bone. Guan Yu refused to take any anaesthesia and took the operation without flinching. In fact, he was playing chess throughout the operation. Hua Tuo successfully removed the poison and Guan Yu was cured.
2. Cause of death - Dying in the prisons of the Wei Kingdom. Cao Cao suffered from severe migraine and Hua Tuo was sought for a cure. Hua Tuo did propose a cure: cut open Cao Cao's head for an operation. Cao Cao was freaked out from a previous assassination attempt by another physician Ji Ben 吉本 and, therefore, thought Hua Tuo was blatantly out to kill him. Cao Cao sent Hua Tuo to the prisons where the old man in captivity soon after.