Tadashi Hikari

Tadashi Hikari (光正) is the father of Yuichiro Hikari and grandfather of Lan Hikari and Hub Hikari. He was a kind old man and a briliant scientist, though sadly he never got to live long enough to see the birth of his grandsons, but he would be very proud of them. Lan still loves his grandpa and wish that his grampa would have just lived a little longer to be with him.

He appeared as data in Alpha in the ending of MegaMan Battle Network 3, and in flashbacks in MegaMan Battle Network 5. In the latter, Dr. Hikari was revealed to have been developed Soulnet, which plays an important role in the plot, alongside Dr. Wily. in MegaMan Battle Network 5, Tadashi seems to speak to Lan through SoulNet and encourages him to keep fighting.

Anime
Tadashi Hikari appeared in a flashback in episode 23 of the first season, where it's revealed he was one of the scientists that worked in the creation of PharaohMan.EXE and sealed him.

A hologram of the Beyondard version of Tadashi Hikari appeared in episode 20 of Rockman EXE Beast. He talked about how Beyondard came into existence, and how Iris.EXE was created.

Trivia
Hikari (光) means Light and Tadashi (正) can mean Right, both similars to the name of his original counterpart, which is called Dr. Light and Dr. Right.