He proposed that someone was first here. Who and what?
ANSWER
Thomas Pynchon in V. proposes that Kilroy was originally part of a schematic for a band-pass filter.
Complete answer by Paritosh(Dada was here!)

Identify.Who is the designer and what does it explore?
ANSWER
Mystery Park located in Interlaken,Switzerland.Designed by Erich Von Daniken to explore the seven mysteries of the world.
cracked solely by ashwini_nit
A. The comic (Katoch’s gonna love it)
B. What is being referred to here.
@UPDATE: Hello?! I start the comic trend, and dont get a question in return? Very unfair.
Answer
Well. Yet another unsolved question. The comic strip is Non Sequitir [Latin for 'it does not follow'. Simply, it means that the conclusions based on a statement are completely absurd]
They are referring to the perennial Internet hoax that sometime in August, Mars will come in a transit near the earth and look ‘as big as the moon’, thus making it seemingly more convenient to launch a craft to Mars.
Connect to a term related to 1 used in 2.
Cracked by Udit and Abhinav(informally)
Answer: Tetris Effect
First image is of tetris , from the second,in the 300th episode of the simpsons, homer used the tetris effect to fill his cars with the goods he bought in a garage sale.