And now, for the MHA Cartoon Guys series... Finn Mertens, from Adventure Time with Finn and Jake, as Blade Boy.

Quirk - Sword Hand. Finn lacks his right hand, but his arm can absorb various materials to form a functional hand, that Finn can morph into a single, large blade, or small, finger-sized ones. The hand/swords durability and cutting power depends on the material; wood and other plant-origin materials are easy to absorb and, if damaged, repaired by absorbing more matter, but are less durable than rock or metal; rock is very durable but it takes more effort for Finn to give it cutting power, plus limiting his agility to an extent due to the extra weight; metal is ideal for durability and sharpness but, like rock, is relatively hard to repair or replace; plastic, fabrics and ceramics can be absorbed too but they tend to be the hardest materials to shape; once he does it, the dexterity is mostly the same as with the other materials. Ice can be used too but it doesnt last for long and can give him hypothermia, so Finn only uses it in case of emergency or if its the only material at hand. Finn can also use this hand to block attacks and punch with increased force, and once he has fully absorbed the material, it takes no effort fo him to keep it fused to his body. To extend the materials useful life, Finn normally removes them when hes bathing (to limit water damage, rusting and the like) or sleeping. Also, while he can do some fine motor actions with this hand, he prefers to use his normal, left hand to do more delicate stuff like eating, typing and writing. The Sword Hand also has the inherent weaknesses of the absorbed material; wood is vulnerable to fire, metal to electricity and extreme temperatures, and so on.

Equipment - Light body armor. Utility belt with standard hero equipment (communicator, painkillers, first aids supplies). Backpack where he carries extra equipment plus samples with various materials Finn can absorb with his right arm if the Hand Sword needs to be repaired. Protective helmet, made of metal and cushioned with damage-resistant fabrics; Finn can use the helmets metal for his quirk in emergency cases.

https://www.deviantart.com/jose-ramiro/art/MHA-Finn-Mertens-Blade-Boy-868818545