You would normally say "Tsukiatte kudasai"
I`ve never heard anyone ever say "kanojo" in a plea. You just... don`t.

"Tsukiatte kudasai" is the normal way to say it.

Doesn't that mean "please go on a date (with me)"? Or perhaps I'm misremembering.

No, it literally means "please date" - but is used as "Please date me" - in other words, be my girlfriend or boyfriend.

Icic... can i request for something more? hee hee.
Can u guys write them in hiragana?

In Hiragana:
つきあってください

In Kanji, as it would normally be written:
付き合って下さい

thanks alot

Will this be the proper way to put it?

くりすさん, 君の事、ぼく、 とても好きです。 付き合って下さいお願いします

Kris, i have always liked you, please be my GF.

need help with confirmation is this the correct way to put it. :)

First, you should put her name in Katakana.

Wait, I`ll just rewrite the thing;
クリスさん、君の事大好きです。　付き合って下さい。

You don`t need to say "I" or to put the お願いします on the end - the ください is enough. (Not to mention they are never used together.)

oic, thanks alot! :)