My kind of fire should be a guy with a normal built and not muscular please, as he does have a strong power and balance of speed. Equipment could be behind him or right beside attached to his legs. The equipment is probably a tank in my opinion(imo). If it isn't, I have another idea that is to have an attachment from the shoulders to the elbows(slightly a bit after the elbow).

I would prefer a water lady and it should be normal maybe a bit slightly slim built. The equipments that I thought of two different ones. One is to have a headwear with something like glasses(like a box [] across the eyes). Another is to have an attachment on the below arm but not wrapping around the arm; More like an external attachment onto the arm.

Electric guy/lady should be kinda slim/paper looking and that depicts more speed:power. Apparently I feel speed is his/her power. The equipment could be wires/pipes attached around his/her body or can even be just a tiny tube tank showing the energy on the back. Adding on to more equipment idea, I thought of may be it can be like Ironman core in the middle or somewhere else.

If it's a guy, I would like a big size built guy looks serious and ready. The equipment that I would prefer is a core in the center or a circular form of thing behind him; kinda like a sun looking shape.

If it's a lady, I would like a normal and slightly more well-built than the Water. The equipment preferably will be a headwear/crown/tiara to control her powers.