Nothing is known about his appearance since he has yet to make an appearance.
Nothing is known about his personality. However, since he is a villain and seeing the reaction of someone who is knowledgeable about heroes and villains, it's most likely that he was ruthless and cruel, as he is still feared now.
Five years before the present age, Toxic Chainsaw fought against Toshinori Yagi. It is unknown what became of him afterward, but his name still lives on in infamy, as shown when Izuku Midoriya asked if he was the one who gave Toshinori the scar on his chest. Toshininori denies it was him though. 
Nothing is known of Toxic Chainsaw's abilities..
|Independent||Stain • Giant Villain • Toxic Chainsaw • Trapezius Head Gear • Sludge Villain • Gentle • La Brava|
|Original Members||All For One • Artificial Humans • Kurogiri • Tomura Shigaraki|
|Recruits||Dabi • Himiko Toga • Magne • Moonfish • Mr. Compress • Muscular • Mustard • Nomu • Spinner • Twice|
|Prominent Members||Overhaul • Chronostasis • Mimic|
|Eight Expendables||Rikiya Katsukame • Shin Nemoto • Toya Setsuno • Yo Hojo • Soramitsu Tabe • Kendo Rappa • Hekiji Tengai • Deidoro Sakaki|
|Independent||Kuin Hachisuka • Three Sturm und Drang Brothers|
|Members||Souga Kugizaki • Moyuru Tochi • Raputo Tokage • Mario Kugutsu • Akira Iwako|
|Members||Curator • Zookeeper • Bearhead|