Just wondering, what is the name of/how to get the card of the chibi running on the title screen that jumps on everyone's head? Also, a bit of an identification of who are the chibis that are getting jumped on by the running chibi?

Right now on the loading screen there's the skit with Runa Kamiwano (military girl) and Hiyori Katagiri (Maid). During events there's the running/super mario skit but I don't remember every chibi being run over. I'll check next event. In my opinion the runner could be Aya Kitagawa (Blue hair and buruma).

I think its someone unreleased for us, for now. She was on the preview screen, before you start the game for the first time. From what I saw, she has a white tank top or t shirt in her card.

I'm pretty sure this one is the runner: [ OOS link to card ]

This is the "girl who all other girls are afraid of": [ HBC link to card ]. She was Elite Guard 3, if i recall it right.
She is also present on this card: [ OOS link ] (see images 3[2]-6[5])

This is the nazi girl: [ HBC link to card 1 ] & [ OOS link to card 2 ]

This is the maid: [ HBC link to card ]

This is the "goth loli" girl with a plushie toy and a machete:
[ OOS link to card 1 ] [ OOS link to card 2 ] [ OOS link to card 3 ]

I can't remember the others and i'm too lazy too google them out, but i think they all have more than just these cards i've found in the SR Rarity section of OOS. I could find more if i could read Japanese, but i can't, so i won't :P