Gold Len AKA Kin Len: http://muvluv-alternative.game-server.cc/cgi-bin/mugen-up/src/up1767.zip.html

Description: A huge Len. That's it. It's a boss character. Has a really damaging attack, but the others aren't that dangerous. It's the MB version, not the MBAA version.
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Opinion: They took G-Akiha by Drowin and replaced all her sprites by Len sprites. The sprite swap is really good, but apart from that and a voice change, there's no more differences. It's not bad as a boss, and if you fought against G-Akiha in MB, you may love or hate this one.

Description: A Len that uses money as weapon. As long as she has mone (you can see the amount at the top left of the screen) you will be able to do all her attacks. Using some attacks, blocking and getting hit depletes the amount of money you have. She can also throw or set money that depletes the powerbar of your opponent. There's also another bar below the money bar that increases each time you block, but I don't know what it does.
Screenshot:

Opinion: That's an interesting Len, I must say. I don't know why there's a money bar, though, since it's imposible to run out of money before the match ends. It's also really easy to spam her attacks with no bad consequences, since they have quite the range. But still, she's interesting, and I recommend downloading it so you try it at least once.

Description: A... well, it's a Len that can charge all her attacks. Has weird hitsounds too. Nothing more to say.
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Opinion: All her attacks, if charged, lead to insane amounts of damage, stun and push that makes it really cheap. She also doesn't have anything that makes her great. Skip it, it's not worth it.

Description: A grappler Len. Nearly all her specials imply grabbing the opponent. Some are blockable, others are not.
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Opinion: If you have seen the thread in Found Releases, you probably know already how the character is. If not, here's what I say. Some attacks do too much damage, and has too much priority in some of them. Her attacks drain the health of the opponent (aka like a poison or burn effect) instead of acting like normal hits, which is kind of weird. But it's an interesting one. Try it and see if you like it.

Description: A Len that that focuses on using grabs and counters to damage the opponent.
Screenshot:

Opinion: All her normal attacks do really low damage, so you have to rely on specials and supers if you want to do damage. They also cause wall bounce and floor bounce. All of them, which is quite annoying. She also is really slow at walking, but really fast at dashing. Yeah, feedback because I really don't know what the creator tried with these mix of things, so I can't really say what I think of her. Personally, Renfield is better than Stela, so if you want a Len grappler, choose Renfield. Still, try it, some moves are quite interesting to use.

and it's by Zenjidoh, not pprn.

http://muvluv-alternative.game-server.cc/cgi-bin/mugen-up/src/up2534.zip.html
Laurent by ria

And why are they called Len, when the Wiki says her name is Ren.....

Many fans use the romanization 'Ren' instead of 'Len',　as that is the standard reading of the name's katakana. The 'Ren' version has more history, and stems from the use of that spelling in Kagetsu Tohya's script and file names; however, it was not used in text visible to the player in that game. All versions of Melty Blood, which prominently feature romaji versions of all character names, consistently spell her name as 'Len'. It is unknown which is the 'real' romanization, as both could be correct (katakana is usually for foreign words and names, which do not always adhere to the rules of the Japanese language). The translation groups Revolve uses 'Len' in their Melty Blood translations, and the Kagetsu Tohya translation project followed their example. However, many doujin scanlations, in particular older ones, use 'Ren'. The origin of the use 'Ren' in older scanlations came from the lack of any romanized source, causing it to be translated in a typical romaji format. Due to the widespread use of 'Ren' before Melty Blood was created, it was generally accepted into use by fans before 'Len' was common.