I would suggest going with two necrofears instead of three. I know that having three shiny necrofears can be tempting, but I suggest against it, perhaps side decking one. Take out both goblin kings. I think that they really need their own deck, even in a fiend deck. They can end up killing you in a topdeck situation. Maybe side deck tribe for the theme's sake.

Add a card destruction. This card can both get you speed, and give you necrofood. Take out cylinders and add a raigeki break. Again, card removal and necrofood. On second thought, maybe keep all three necrofears. Sounds kind of fun. Add a nobleman of crossout, unless it conflicts with dimension fusion. Creature Swap works well with used jeroid, and sangan, so add a second jeroid and a creature swap. That's about it. Tried...
By the way, awesome sig. Made me feel better. lol...it actually did. Can you r/f deck in sig?

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ok dude ive runs fiends since IOC so i know a thing its good but could be better take out the giant germs and goblin king i know i love them too but too bad sorry and only 2 they are good not great and put in another jeroid and newdoria ohh and take out a slate think about it book of moon then noblemen your boned most of the time add 2 Archfiend soldiers and a Skull archfiend for more power and a theban for top decking cases or when you are out of choices and a kuriboh or 2 wont be bad either for spells/traps take out a trunade and the fissue for 2 smashing ground and/or nobleman of crossout and take out the magic cylinder and ceasefire for threating roars.

so there you are dont know the exact count of the deck but add something good if its short a few and if its over 40 dont worry its better a little over
so let the darkness reign man

Ooh! A bit of an extremist are we? Well let's see what can be done with this that leaves you all 3 Necrofear, since that seems to be the fun part for you.

First off, add a second Dimension Fusion. If you have the opportunity to remove a potential 9 monsters for all 3 Necrofear, you will want more ways of retrieving them.

Ill agree with the others on ditching Goblin King. Keep one in the side deck and see if that might have a chance of getting play with swarming. Otherwise its not really doing much other than waiting for for chance.

Reduce the monster count just slightly. I dont see a real need for Jeroid. The 3 Slates will cover that effect. That would be better served with a 2nd Newdoria. And, despite its stable effect, I am quite opposed to seeing Breaker in this deck at all. I dont' think it fits at all.

That puts you with 18 monsters:
3 Necrofear
1 Dark Ruler
2 Giant Orc
3 Slate Warrior
3 Giant gerrms
2 Newdoria
1 Sangan
1 Sinister Serpent
1 Morphing Jar
1 TIV

Spells- Fissure is the obvious weak point. There are loads better removal cards these days. What heavenlyknight said about Raigeki Break is right. It will probably serve you the best.

However, in the green dept, I would use a Nobleman of Crossout. Add the 2nd Dimension Fusion and you have the potential for a nasty swarm combo. I heard this long ago and repeat it whenever I see someone with similar tastes. Set your own Slate and No-X it. then use Dimension Fusion and you have just swarmed the field with 3 1900 attackers in one stroke.

Card Destruction, another mentioned earlier is a good thinner card. Very helpful at times. When its not helpful, dump it as part of a discard cost.

Don't forget about some of the specialized fiend help available. In this case, since your monsters are mainly 4 star Fiends, I'd suggest Puppet Magic of Dark Ruler, since it can recur and remove for a DF swarm. If you find you are having trouble getting the proper amount of Fiends in the Grave for what you need then you can take it out. There's a million options.
14
Pot of Greed
Graceful Charity
MST
Heavy Storm
2 Giant Trunade
Lightning Vortex
Snatch Steal
2 Dimension Fusion
Nobleman of Crossout
Premature Burial
Card Destruction
Puppet Magic of Dark Ruler

traps: Trade out the Bottomless Trap Hole cards. If you are using Dimension Fusion why offer them the opportunity to get their card back? Those are where the Raigeki Break can go.

Ceasefire out, Magic Jammer in. this adds one more discard and is more secure against opposing spell cards.

8
RoD
CotH
Mirror Force
Torrential tribute
2 Raigeki Break
Magic Cylinders
Magic Jammer

I hope some of this is useful to you. have fun.