Black Guilmon

Virus

Black Guilmon can be quite aggressive to all it sees, ferocious even, this is due to the Digital Hazard on it’s body and its Virus attribute

Reptile

Nightmare Soldiers, Dragon’s Roar, Nature Spirits, Metal Empire, Jungle Troopers

It’s first Digivolution is to Black Growlmon, which is even more wild and aggressive

Black Growlmon Digivolves to Black WarGrowlmon who’s even more aggressive than Black Growlmon

Black WarGrowlmon Digivolves into one of two Digimon that are theorised to be one in the same: ChaosGallantmon (also known as ChaosDukemon) and Megidramon both of whom are exceptionally violent

Rookie

Black Guilmon has a reptilian body with small dragon wings for ears, its belly is white but its hide is black with red highlights, most prominently the Digital Hazard (A symbol made of four triangles, one in the middle and three around it akin to a hazmat symbol) on its belly.

Black Growlmon retains the reptilian appearance and colour scheme of its previous form, but its replaced the wing ears with horns, its much bigger, its claws are sharper and have black highlights and it has glowing yellow runes on its body, it also has white hair

The reptile appearance, black colours and white hair are retained but now it’s upper body is near entirely mechanical and it’s red is replaced with green

ChaosDukemon bares a large resemblance to Dukemon (also known as Gallantmon, a Red and white Royal Knight that has a Lance and shield) but with a big change it’s silver and dark blue.

Megidramon is a legless dragon that bares the Digital Hazard on its white belly and and gold plated shoulder pads. It’s body is red white black and orange with some gold

The Digital Hazard symbol appears on the bodies of certain Digimon. According to Digimon Tamers, the presence of this symbol means that the Digimon has the potential to be highly destructive, and, if corrupted, could threaten the very existence of both the Digital World and the Human World. It is not infectious, it’s just a major threat to all. This actually leads to even Mega level Digimon to leave those with the Digital Hazard well alone. Digimon with this symbol include Lucemon (The Digimon Sin Of Pride), Megidramon, Gallantmon (The Virus Royal Knight), MirageGaogamon (A wolf mech on the outside) and ChaosGallantmon.
Most with the Hazard are evil with a few exceptions like Gallantmon and MirageGaogomon

This Digimon fears few things, but they are Mastemon (Portal Opener), Proximamon (a Reality Warper), GranDracmon (An immortal who Rules the Dark Area), Milleniummon (Yet another reality warper), Yggdrasil (The host of the Digital World and can therefore wipe the whole server), Lucemon (Demon Lord of Pride), Beelzemon(Demon Lord of Gluttony), Barbamon (Demon Lord of Greed), Belphamon (Demon Lord of Sloth), Leviamon (Demon Lord of Envy), Daemon (Demon Lord of Wrath), Lilithmon (Demon Lord of Lust), Omnimon (a Royal Knight that is nigh on unbeatable) and Abadomon (a horrifying monstrosity)