This is Ripley Marduk and MythMan.EXE. They are supporting characters in MMBN: ReInstalled. They fill the role as one of Lan's friends and a confidant at SciLab, where they intern.

Ripley is a pretty smart character, having worked with Mr. Famous and Dr. Yuichiro Hikari on the Cross Fusion Project. He kickstarts the plot by giving a Synchro Chip to Lan, asking him to keep it safe for the time being. In reality, he did that in hopes of getting him to take part in an operation against the WWW. He's gets tired from working through the night, which happens often due to being Famous' (second) assistant. He's a good Net Battler, while nowhere near Lan's skills, and he can hold his own if neither he, Mayl, nor anyone else good enough is around.

Myth Man is based off of a dragon, but also off of a certain YouTuber who's avatar is a dragon, likes shiny things, and is a major fan of the Classic and Battle Network series. He is a versatile Navi, but has a strong desire to claim Zenny and mystery data as his treasure, which could get him into trouble. Even so, he wants to prove himself worthy of being Ripley's Navi.

Mega Man Battle Network © Capcom

Ripley Marduk and Myth Man © HatOnFire/Me