The former holder of the title "Number Two," Afro is out to hunt down Justice, the man who killed his father for the rank of "Number One." From the time he was a child, Afro honed his skills as a swordsman; his style typically consists of wielding his sword with only his right hand while his left continues to hold on to his sheath, although during his fight with Jinno, he held his sword with both hands to compensate for Jinno's dual wielding speed. He is a very quiet individual, likely because the life of the "Number Two" does not allow him to have any close relationships with anyone, so when approached by others he says very little, if anything.
Although he seems cold, he is still haunted by his memories and past relationships; Justice later remarks that Afro, like his father, is still "soft inside." He also has a fondness for lemonade.
The only times Afro had shown any extreme emotional reactions were when he fought the Sword Master for the Number Two Headband, and when fighting Justice who reminds Afro of his father's tragic death.
At the end of the series, he kills Justice and becomes the "Number One", but is almost impaled by one of Justice's spikes only to survive by having the spike go through his afro and skim that top of his head, thus saving Afro from death.
After the 'death' of Ninja Ninja, Afro seemed to be able to show himself more emotionally, as seen when he sheds tears for 'killing' Jinno before facing Justice, and also by his casual conversation with Jinno before facing him for the second time.
They say that revenge is sweet and that it is also a dish best served cold. This also happens to perfectly describe ice cream. Come take a look at characters who are sustained by their vengeance and not just ice cream.