Lil Cal is a puppet who has been identified as a juju so his existence is an ontological paradox and he has no true point of origin. For a timeline see this post. 

Doc Scratch bestowed upon her that condition when he recruited her into the Felt. The details of the process are left unknown but it made her blood blue.

The game could’ve successfully worked with two players since you really only need a Time player and a Space player to actually complete the session. Rose states here in her walk through that the game seems to suit two players most naturally, the server and the client.

He used the portals in the Frog Temple to enter the Medium and get Jade’s dream corpse.

She started yelling about it here.

Eridan thinks magic is fun even though he believes it’s fake.

Vriska has been using the phrase “Why don’t you can it” from the beginning.

She was killed by Spades Slick during [S] Cascade.

Dave states here that he thinks Jade could beat him.

Gamzee once reached into his modus and physically retrieved his husktop instead of deploying it.