At Animazement, I asked but didn't get a 
sketch from Kia but I beleive Marcus did - so
depended on artists mood.

Got 2 sketches from El Hazard character designer 
with no trouble at all at Animazement.

At Anime Central asked for Touga sketch, but Saito 
and Ikuhara would only do ChuChu.  Had to settle 
for that, Saito's ChuChu sketch is quite cute.  
Think I mainly got those as Debbye was right in 
front of me and got ChuChu sketches, so they 
couldn't then say no to me.