So I've done some experimenting and found a pretty good defensive/combo lineup for fire main. Now this lineup isn't EXACTLY F2P as you do need 3* and up Garaa.
Now first of all for this lineup to work you need a ninja with this: https://images-ext-2.discordapp.net/eyJ1cmwiOiJodHRwOi8vaW1hZ2UucHJudHNjci5jb20vaW1hZ2UvMGU1NzBiMGU1MGQ3NDkxMThlMTBlOTZkMGQwNmVlNTQucG5nIn0.szjx-KNTEqasgcScdEhgIR-1EYk?width=400&height=18

It doesn't have to be the EXACT one but it NEEDS 'Chase and Attack the Low Floated Enemy' for the combo to work. Now, the ninjas I found that can do this (but not limited to) are: Zabuza Mist Seven Swordsman, Suigetsu, Zabuza (Regular), Temari and Tayuya.

Now for the lineup it would be this: https://cdn.discordapp.com/attachments/241346493951377410/241349740241879040/Screenshot_at_Oct_27_19-56-55.png

BUT for it to work you need to place them in a certain order. You would have to place your MAIN FIRST, GNW SECOND, Then Zabs (or whoever has the pursuit I showed, then Garaa.

And to know if you placed it right, Kankuro's Sasori puppet should also have a shield.

Now the skills for this would be : http://image.prntscr.com/image/707e1eea0ec64c26b5d5eb1177c37e5a.png

The pet would be : SHARK

Bam! You have a solid defensive/combo team! Hope you like!