Leomon

Leomon is one of the first good Digimon that the DigiDestined met on File Island. He is a Champion level Digimon.

Digimon Adventure
In Evil Shows His Face,

In Subzero Ice Punch!,

In A Clue from the Digi-Past,

In DigiBaby Boom,

In The Legend of the Digidestined,

In Departure For a New Continent,

In Ogremon's Honor,

After Apocalymon's defeat, Leomon is among the deceased Digimon who were reborn.

Digimon Adventure 02
In A Million Points of Light, Leomon briefly appears during the final battle with MaloMyotismon as the partner of an unknown DigiDestined.

Digimon Adventure tri.
In Determination,

With the Reboot bringing back Digimon who have died in the Digital World and Real World, it is most likely that Leomon was among the Digimon who were brought back to life.

Trivia

 * He is one of DigiDestined's allies to return in Digimon Adventure tri..
 * He is second of DigiDestined's allies to become Infected Digimon.
 * He dies two times.