Heidel is a haughty person with a lot of money and connections, who enjoys using his position as a noble to do whatever he wants to. Though seemingly a busy man, he throws extravagant parties on a regular basis.
Prior to the October War, Heidel was the director of Reinford Group's 1st Factory.
During the October War, the Noble Alliance seized control of the Reinford Group, giving him the Eisengraf. Heidel took advantage of the chaos by hiring Nidhoggr jaegers to kidnap Irina Reinford and kept her hostage onboard the train, keeping her as far away as possible from him. He then occupied the building's twenty-fourth floor, which is where the Reinfords made their residence. Publicly, he claims that Irina has fallen ill and states that he will temporarily assume her position as acting chairman until she recovers.
As acting chairman and member of the Noble Alliance, Heidel shut down half of the group's divisions, forcing the other half to make weapons and Soldats for the war, doing the same with other businesses in the city. With these changes, share prices dropped, the group stopped exporting, and the city started receiving fewer tourists and trade, making the citizens unhappy.
After Rean, Alisa, Angelica and the others rescue Irina, they go after Heidel to take the company back and arrest him for his actions. Heidel panics as the Nidhoggr jaegers are unable to apprehend Irina and Sharon, so he opts to unleash swarms of archaisms in the building, disregarding the safety of his employees. When confronted, he deployed Regenenkopf Type-0 and four Shigure archaisms, although they were destroyed in the ensuing battle. Irina then arrived, commending him for his slyness, but condemned his arrogance for using her home as his, promptly incapitating him in a few blows. When Gerhart declared his neutrality in the ongoing war, he takes a leave of absence from his role as Director in the group, and is confined to his mansion for his crimes.