Bt X (12)
The B'ts are intelligent bio-machines that are brought to life with the blood of a "donor," with whom they then partner exclusively. X, long since consigned to the junkheap after his donor disappeared, comes alive when Teppei inadvertently suffers a wound from some of the sharp edges in the junk and drips on him. The first opening sequence, from which this cel comes, shows X's problematic early relationship with Teppei -- if Teppei doesn't hang on tight, he's going to be bounced right off!
B't X and its sequel, B't X Neo, are in that odd category entitled "Shows I absolutely adored and have no good explanation of why." Teppei screams non-stop, the plot devices are plodding and overly coincidental, and by all rights I should have hated it. But I didn't; I loved every second and ran through both series at breakneck speed. Go figure.