Dub Name Change: Known as Charles Lightning in America, Dr. Kilroy in the United Kingdom, and Professor Articus or Professor Titus in Germany.
Everyone Is Related: Not only is he Johnny Thunder's uncle, as confirmed by LEGO Mania, but he is also the brother of Dr. Cyber, as confirmed by LEGO World Club Magazine. According to Word of God, Dr. Cyber is Tim Timebuster's uncle, which would make Dr. Kilroy, Johnny Thunder, Josh Thunder, Dr. Cyber, and Tim Timebuster one big happy family.
Ace Pilot: Not as much as Harry, but he does act as the group's pilot in some of the sets.
Expy/Suspiciously Similar Substitute: For Harry Cane during the Dino Island subtheme. This was made especially clear in LEGO Soccer Mania, in which Mike was erroneously named "Harry Cane" (while the real Harry Cane went by his European name, "Billy Speed").
Dub Name Change: Prior to the Dino Island line, he was known as Baron von Barron in America, Mr. Hates in Europe, and Alex Gluipstra in the Netherlands. Other sources also called him Evil Eye and Ulrich Unhold.
Spell My Name with an S: A literal case; his name is alternatively written as either Gabarro or Gabarros, with the latter spelling first being used in Standing Small. However, most sources from 1999 refer to him as Gabarro without the "s".