raava's answer

technique: healing, it's one of the most useful techniques of waterbending. character: korra @eyuiow

technique: blue fire. you can generate super hot and perfect fire. character: azula @yatura_izuku

technique: eaeth armor. you can cover your body with a layer of earth to protect yourself. character: toph @abrokenfantasy

technique: heat manipulation. controlling the temperature. character: zuko @Mocaccino_04

technique: sand bending. controlling sand and little parts of earth. character: kyoshi @azkabanprisowner

technique: fire stepping. it's a way of flying with little parts of fire under your feet. character: asami @InTheFarDistance

technique: combustionbending. you can explode things with your mind. character: p'li @zk520l

technique: lava-bending. you can control smooth and hot earth. you can also turn solid earth to lava. character: bolin @AdifferentversionofAS

technique: plantbending. you can control plants through the water in them. character: kya @windzangool

technique: breathe control. you can take off the air in creatures' lung and make them choke. character: zaheer @mikimikiisher5171

technique: sound bending. you can control vibrations of air to generate or change a sound. character : yangchen @Sepid_silver777

technique: air shield. it's a way to protect yourself and it's a kind of negative jing. character: tenzin @Turquoise_am

technique: blue fire. blue fire is a perfect fire that comes from a top level of mastering waterbending. character: azula @chsluvs

technique: ice bending. the power of turning water into ice and controlling it. character: katara @tiredfirefly

technique: metalbending. controling and shaping metal is how metalbending works. character: kuvira @dystopiaism

technique: fire manipulation. you can control the temperature without a real flame. character: wan (1st avatar) @dark_myself

technique: fire breath. you generate fire with your mouth just like a dragon. character: azula @Voodoogast

technique: lightning redirection. it's a firebending technique that based on waterbending, since you said you like both of the elements. character: iroh II (zuko's grandchild) @cereall_killer

technique: energy bending. it's a technique that only avatars can master. character: aang @lulusutar88

technique: fire jet. you can use fire bending of your foot to fly across the sky. character: zuko @farawayfromfair