I drew this for the Illustration Friday topic, linked.
My drawing is of two comic book characters Tsubasa (Syaoran) Li, from Tsubasa: Reservoir Chronicle, and Kimihiro Watanuki, from ×××HOLiC. These two comic series and characters are linked.
When Tsubasa turns back time in attempt to save a character in another universe, he is erased from his home universe. When this happens Kimihiro is created to fill the gap in Tsubasa's universe. Kimihiro is essentially another part of Tsubasa, Kimihiro becomes the child of Tsubasa's parents and fills any relationships Tsubasa would have made. Kimihiro's existence is essential to keeping the multiverse stable.
For my actual illustration Tsubasa (known as Syaoran for most of the series) is in the left panel and Kimihiro is in the main panel. The smoke from Kimihiro's kiseru is linked to Tsubasa's magic that is surrounding him in that panel.
×××HOLiC is easily one my favourite comic series, it is a more supernatural/slice of life story, compared to Tsubasa: Reservoir Chronicle, as it starts out as an action/adventure series, but slowly the many dark plot twists that occur make it very interesting and make both series have some good dramatic elements. Even the fact that these characters are linked isn't revealed until far into each story.