User blog comment:DandyAndy1989/Discussion - Why is Lincoln on every title card?/@comment-32045623-20170519021148/@comment-406459-20170519022207

I was actually thinking about this today as well, in particular the Sunday logo boxes for Peanuts, which would frequently depict Charlie Brown's head as some other round object (the sun, a globe, a "0" on a scoreboard, etc.). Seeing as The Loud House is heavily inspired by Peanuts and Lincoln is pretty much the "Charlie Brown" of the cast, it makes sense that the title cards would play on the main character's distinctive head in a similar matter.