|Ultimate||Megido Tyrannomon, MetalTyrannomon (Vaccine)|
|Mega||MagnaTyrannomon (Burst Mode, MagnaTyrannomon (Ruin Mode)|
The name "DemiTyrannomon" refers only to the Rookie form of this Digimon. Throughout the series, DemiTyrannomon gains the ability to digivolve into a number of more powerful forms, each with a different name and special attack. The Rookie level, however, is his preferred form and the one he spends most of his time in. It is also the name he is most commonly referred to.
DemiTyrannomon is Agumon's Rival with red skin black stripes and green spines.
- DemiTyranno Breath (Pico Flame): Shoots an orange and red fireball from his mouth.
- Claw Attack (Cross Fight): Slashes with claws.
Koromon is DemiTyrannomon's In-Training form.
While waiting for his partner, Botamon digivolves to this form on File Island. With the rest of the DigiDestined's Digimon, he plays with the Digivices until they disappear one day, heralding the arrival of their partners.
From then on, Koromon only appears when DemiTyrannomon uses too much energy by digivolving to his Ultimate or Mega forms.
Koromon is Agumon's In-Training Digivolution in Digimon Tamers: Brave Tamer, digivolving to him as he recovers from depleting his YP. His default technique is "San no Awa".
Tyrannomon is DemiTyrannomon's Champion form.
DemiTyrannomon first digivolves to Tyrannomon in a perfect mode. He defeats Seadramon with his fire blast.
MegidoTyrannomon is Tyrannomon's Dark Digivolution Ultimate form. When Michael gives DemiTyrannomon to eat vegetable to get too much food Just like Tai did it to Agumon. Tai gets upset and he mistakenly digivolves Agumon into SkullGreymon.
MetalTyrannomon (Vaccine) is DemiTyrannomon's Ultimate form. He is an Red Metal Tyrannosaurus Rex with a MetalTyrannomon armor. He fights with his enemies like SkullTyrannomon, MetalTyrannomon Virus and MetalGreymon Virus.
MagnaTyrannomon is DemiTyrannomon's Mega form. He is equipped with the "Dramon Breaker" arm guard and the "Brave wing" on his back.
If DemiTyrannomon can warp digivolved into him.