I've had Demigod for awhile, but it wasn't until recently that my roommates got copies of the game also, which has resulted in many epic LAN parties to the dismay of our girlfriends. This continued for months, until one day, a post was made on facebook in imitation of a rap battle we had all seen on youtube, themed to demigod. This resulted in 3 of us going back and forth over the course of a day, using a lot of different Demigods. Many many lulz were had, and I thought I would share them here on the forums, since I don't know another soul besides my roommates who actually play the game.
Inspiration: Epic Rap Battles of History by nicepeter
Watch the "Epic Rap Battles of History" videos, We took single verses from different videos and reworded them to fit Demigod. There was no real order when we made these, but I organized them the best I could. Enjoy! 
DEMON ASSASSIN VS REGULUS
You’ve got front row seats to your own extinction sucker
You look like barney the dinosaurs’ retard brother
You’re soft, and fragile, like origami and jelly
I’m gonna shoot you, cut you up, and serve you in a publix deli
When you die, you won’t even know what Regulus did
his mines will blow you up like a Liberian kid
You’ll rage quit, cry, and then call me mean
when I snipe you in the face from across the whole screen.
The character screen forgot to mention the fact
That when Regulus has no mana, his anus gets packed
Check your goggles
They call me a Demon
Assassin
Nice crossbow
You look like a redneck Nebraskan
I prefer the company of daggers and some sick warps
You try to win your battles with some Nerf darts
You think your crafty catch-phrases make you sound cool?
No one gives a shit if the cow says "moo"
Watch what you say, I never miss my mark
My goggles make me see so good, I’ll hit you in the dark
When my upgrades get bought, I’ll be decked like Tony Stark
I’ll blast you into dino-bits and go remake Jurassic Park
So I’ll tell you once Raptor, you better listen well
Use that Amulet of Teleport and get the fuck out of my Citadel!
DEMON ASSASSIN VS THE TORCHBEARER
I pity the fool who tries to step to Torch Lane
Call me AOE fire, cuz I'll burn your whole gang!
Bring Cat Lady, Oak, and little Rook to the game
And watch me dip their ass in lava, and pump up my kill chain, Sucka!
I'll overwhelm you with your own minion portal
You couldn't even beat me five on one in your citadel
I will finish you with a Fireball camping in your closest Tower
No one's going to save you, because all they do is cower
Fifty kills and 65 assists in the game
Is what the demon assassin puts up
While torch bearer's in the back being lame
I’ve read up on your facts you do fire and ice a lot?
Well, tell me TB how come you never sat down patented IcyHot?
You're a floating target trying to AOE everyone
But you always get had , t's so easy it's not even fun
I'll crit you alot, rip your cloak apart
Break your staff in half and call you a tard
You're a terrible assassin
I always get more kills
Enjoy your twirling baton
While I enjoy my skills
Sit down son, and let me give you a murder lesson
Ask Oak , I've got more stones than Rook and Oculus
Never patented Icyhot?
This will never be forgot
I've committed atrocities that will last throughout the match
Your attacks gets you numbers on your assists tab, bitch
I'm committing scorching murder in the major third degree
My name is Torchbearer motherfucker, made you got killed by me
Not some baton twirling faggot, I'm the real OP
You wanna trade blows? You can't even hit level three.
UNCLEAN BEAST VS REGULUS
Come get this flag, I hope you know the stakes
I'll bite the shit outta your shoulder blades
and spit my venom in your face
I have been barbaric on your ass, you bastard
my moves are bad-ass, yours make you look like a crippled asshat
ye hoebag, you're a winged fairy with no swag
and no tailwind, egads, that's so sad
and to top it off you're not a marksman,
I've never seen a weaker wingspan
you crook, you,
I bet you said you shot the rapping Lincoln, too!
Ohhhh boy, look what we have here,
a little doggie with a yeast infestion trying to be God of the Year
Your movements look like a puppet having sex with a bag,
you put a lot of artifacts on you but you still hit like a fag
Put down that gold doggie, go make some upgrades and,
stop using the same spitting moves and
You may be Demi, but you aren't a god at all,
I see them favor points you're not getting, that takes no balls.
When I apply my battle theory, Vile Beasts everywhere rejoice
So Stop flying Reggie,
No mana? You don't have a choice.
What’s with your goggles?
I can’t frickin tell
You look like the Wright brothers
On a thuper gay thpell.
I’ll school you anywhere
You worthless little speck
Get your wings shot off
Like Dogma's Ben Affleck
I'm a giant dog with huge claws
You better be scared
Cause that means Vile Beast
will leave you impaired
QUEEN OF THORNS VS REGULUS
I am the Queen of Thorns, ruler of all plant life,
Little known fact, also dope on the mic
You are Regulus, with your little wings and bow,
and some lame-ass catchphrases to cover up your weak arrow show
You are a force from afar, I am a force truly powerful,
even went back behind, and waxed you at your citadel.
Because look at you, you aren't even a real demigod,
I preferred you as the AI, who doesn't play like a retard!!
Youuu, got no idea what you’re messing with here girl, I got 50 Cal shells in my bow that’s how I roll Y’all,
You’re as useless as a Japanese sex doll
My arrows will make you slow,
your four shamblers simply blow
you can’t compare your speed or range against my kind of bow
I’ll make you break like, a cheap TV appliance,
as I drop mad arrows on your head with my Girdle of Giants.
UNLEAN BEAST VS ROOK
There are 10,000,000
Million, million, million, million, million, million, million, million, million, characters in the universe that you coulda been
You selected the Gibraltar rock and figured that you would win
You wanna bring the slow
With the cripple speed you're gettin
I'm just gonna warp in, slice, and warp out, bloodlettin
And while it’s true
That your ingrown towers shoot poo
You give me lots of experience
Every time I finish you OOOH
Rook's here, it's about to get real,
Watch me hammer these noobs like it's Amityville
I don't like to gank bitches from all classes,
But when bitches step up, I hammer bitch asses
Rook's a fucking castle, and there is no equal
So spend less time farming and start healing your people
PUNK
I'll Hammer drop your whole goddamn health bar
And only with my gigantic bitch killing HAMMER!
VARIOUS
OAK VS REGULUS
Hi, Oak the Paladin here, with a special AoE Group Heal
Watch me overwhelm this flapping flaming cliche fallen angel
I'll take my awesome army, and plant my Spirit Wards all over
Then chop your wings off like an unwilling organ donor
I'm Lord of the generals, and leader in total kills
You're just a one-liner faggot who invented the 'Fail"
Oak may have the Magical Coin Purse, but you're in for a shock
When I strike you with bolts from my lightning-rod cock!
OCULUS VS REGULUS
I am float fucking goat I spread more amps and volts than your dirty dog can handle bitch
I sit on my chair, and make angels from my stick
I’ve got an upside down pyramid that grows from my dick
I shock minions, when I smell them bleed
I don’t smash buildings, they just crumble to please me
My tazer, makes your spit wish it burned more
so assume your position, and take it on all fours!
DEMON ASSASSIN (?) VS OAK & QUEEN OF THORNS
Hi there neighbors
I hope that you can take me 2 on 1,
because 2 on 2 would end in your oppression
by level 5 your citadel will be in my possession,
Oak's little tards swinging their shit can't even touch me,
And that axe is for show, it can't even harm a tree.
Speaking of plants, Ms. roots, it's time to step aside
the only minion I can summon is a can of pesticide.
I can own you any day without fallin'
You call yourself "Queen" but your name used to be Nalin
And that's all we made thus far. There's a couple inside jokes going on, and for those who actually read all this, Nalin is the name of a player in our group. There truly was no direct back and forth between demigods (except for one of Torchbearer's verses), I just put them in the best order I could. Hope you enjoyed it, maybe we can get some real original rap battles going here on the forum!