My friend had a real janky mono red edh deck that durdeled around and burned someone out and died. you could have him be a commander for that type of deck or have a weird mono red storm deck with
neheb the eternal that way you get tons of mana after each combat phase and keep doing a bunch of nonsense that would be cool.
mono red in commander is weird cuz if its not goblins its super janky but honestly like playing every cheap burn spell plus cheap red creatures and curving in to etali then doing some multiple attack steps would be pretty fun. play cards like
young pyromancer,
thermo alchemist, theres an old 6/1 legend thats funny but i can't remember its name. maybe
brass's bounty copy that with one of the copy spell effects would be ridiculous. thats the way I would go, now it would be super durdely and janky but it would be super fun.
hope this gives you some ideas. If my friend still has that deck list laying around i will put it up for you to see i dont think he has it anymore tho.