>>16536724While I disagree on those first two points, what I mean is that fire/electric will likely need a good base concept in order to not look over complicated. With most designs, like for example ghost/grass, it's easy to go with the "forest spirit" concept. With fire/water, instead of a pokemon looking like a garish abomination of a dolphin with speed stripes and a fire-spouting blowhole for no reason (which is pretty much where we're at with the cheetah now), they made a creature that utlizes hydro energy (or whatever it was; i am nut gud at the energy-related specifics).
With most typing like that grass/ghost example it's pretty easy to come up with a concept that isn't just a random assortment of fire-tails and water bubbles tacked onto an animal. Take concepts from culture, look at the concept from another angle, all before you start drawing.