Username with changed...

[shihokudo]

moomooimooomooumooo

write your username normally and then in superscript

[breva]

breva ^breva

replace every second letter for 

[KainTheVampire]

K i T e a p r

Replace all vowels with Tea

[Callid]

CTeallTead

Have every letter of your name link to a different TV Tropes site you think could be used to describe yourself!

[nomemory]

nomemory

What a pain.. Could probably have done better.

Make every letter in your username a word that describes you.

[Callid]

Nom! <3

Cunning
Annoying
Lazy
Logically minded
Intelligent
Dogmatic

Idem nom. (This could actually be a forum game of its own )

[Dus]

Deppert
unberechenbar
Säufer


Idem

[Silver1412]

Short
Immature
Loud
Victorious (I NEVER lost a spar ~nya!)
Evil
Random

Idem

[Hoshi, tantei-chan]

Honest
Observant
Smart 
Helpful
Interesting

I only did 'Hoshi' since it was too much work and it's hard to look for adjectives XD

Idem

[Borealis]

Bored
overreacting
rude
emotional
apathic
lazy
isolating
straightforward


Code your name with the Caesar cipher

[Silver1412]

Vloyhk1412

Replace all A with O and all O with A ~nya.

[HeijiBobPatiño12]

Heijibabpotiña12

Replace all the words with their consecutives words

[sonoci]

I'm guessing you meant letters

tpopdj


Write your username with dashes where the syllables would be (so we can say it correctly!)

[queenmisanagi]

queen mi-sa-na-gi

Write your username inside a line/lyrics of your favorite song

[Callid]

Und wenn auf meinem Stein sich frech / das Unkraut wiegt im Wind,
Die Worte "Ewig unvergessen" / überwuchert sind,
Bleibt zwischen den Parolen / von Hass und Bitterkeit
Vielleicht auch das Wort "Callid" / auf den Mauern jener Zeit.
- Die Mauern meiner Zeit, Reinhard Mey

And if the weeds on my [grave] stone are swaying boldly in the wind,
If the words "Forever unforgotten" are overgrown,
It might be that, amidst the rallying cries of hate and bitterness,
perhaps also the word "Callid" remains on the walls of that time.
- The Walls of my Time, Reinhard Mey

(BTW, the word substituted above is "Hoffnung" - "hope")

Idem sonoci, but also add an apostrophe in front of every stressed syllable, and two in front of the main stressing.