Size: Medium (signature size)
Characters: Pikachu
Text: Chakra or Chakramaster (whichever fits bets =D)

Size: 150x150 (avatar)
Characters: Pikachu
Text: again Chakra or Chakramaster. Chakra may be better for the sizing

these look amazing Neo! The animations and everything. So I just HAD to sign up for this as well! =D

Not really too much preference. Since you're the artist here/creator I'll leave the creativity in your capable hands