First, you'll need to make an animation, use this as a base sprite for it.
Base Sprite:https://cdn.discordapp.com/attachments/736032294799671348/739376680661155901/unknown.png
Fire Color List: https://cdn.discordapp.com/attachments/740324872957198366/741433442075672626/colors.png
Make sure to do the following
- Upscale 200%
- Make the first frame the original base sprite

To actually add the fire support add this code into Inti.gml
//fire support
fire_taunt = sprite_get("tauntnamehere");
fire_taunt_duration = how long it is;
fire_taunt_frames = amount of frames;
fire_taunt_sound = sound of the taunt;
fire_taunt_sound_frame = frame where the sound comes out;

To change the offset add this code to your load.gml
sprite_change_offset("tauntnamehere",x,y);
Change X and Y to the X and Y values

Later on sound will be available to change too.
Just not at this moment.

If you have any trouble getting it to work, please don't hesitate to ask for help.