As the largest of the nine man-eating giants, Fleshlumpeater stands at an immense 54 feet tall, making him more than twice the height of the 24 foot tall BFG. He towers over the other evil giants, possessing immense muscular power, thick, powerful limbs and a terrifying physical dominance that he uses to bully and intimidate the BFG. One of the most vivid physical details noted when he opens his mouth is his tongue, which is jet black and described as looking like a thick slab of dark steak. Like the other wicked giants, he is intensely ugly, horrifying, monstrous, brutish, intimidating and menacing, lacking any gentle or kind features in his face. Like the man-eating giants, he wears very primitive, basic clothing, essentially simple garments or skirt-like coverings wrapped around his massive frame rather than human-style tailoring. Fleshlumpeater is built with an immensely muscular, bulky, heavy-set frame, featuring a small head relative to his massive body, reminiscent of a Tyrannosaurus rex. He displays a muscular physique, broad shoulders, large biceps, prominent, untamed red-to-ginger hair, a matching messy beard, sharp, hungry eyes and a mouth filled with crooked, jagged semi-sharp teeth. He also wears rustic, primitive attire consisting of a simple brown kilt or skirt-like covering paired with a patterned, grassy cloak made from furs and natural elements. As the tyrannical alpha leader of the man-eating giants in Giant Country, the Fleshlumpeater is a sinister, grotesque, terrifying, ruthless, bloodthirsty, sadistic, selfish, black-hearted, aggressive, brutal, cruel, heartless and dangerous brute who rules his brethren through fear, dominance and intimidation. He is the largest, intimidating, fastest, monstrous and most feared giant, possessing an insatiable, horrifying hunger for young children ("human beans"), using his sense of smell to sniff out the presence of humans from considerable distances and using his immense sheer size to dominate others. He even holds severe contempt for the BFG, whom he views as an inferior "runt", due to his small stature and refusal to eat humans. He acts like a violent bully, leading the other giants in physically tormenting the BFG, abusively treating him like a toy and throwing him through the air when they cross paths on his way to Dream Country.