Hullo, I'm pradlee. Nice to meet you. 
1. I would prefer to Beta for original MM stories of any type (romance, fantasy, sci-fi, action, horror, et cetera), but, because I enjoy reading just about everything, I am also willing to edit just about anything.  I am fine with MM and FF fanfiction, but my performance on these could be affected by not being familiar with the story off of which they're based.  I might refuse the job if I'm not acquainted with the original story and characters.  I enjoy unconventional relationships (e.g. macho gay jock, snarky midget, falling in love with an animal**) and unconventional, surprising, unique, new premises. 
2. I absolutely refuse to have anything to do with stories that focus on heterosexual romances, fanfiction or original.  I am, however, fine with heterosexual heroes, as long as the story is centered on fantasy or war, or something else similarly action-packed.  I won't do fanfiction whose main purpose is sex.  I believe in developing a plot and good, complex characters.  I dislike cliché anything: character stereotypes, gender stereotypes (e.g. dumb blonde, macho homophobe jock), plot (falling in love with rapist). 
3. ^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
4. Ermmm...  Should I go into teacher recommendations...?? 
Well, I've always gotten top marks in English.  I enjoy reading.  I enjoy analytical writing.  I enjoy editing others' writing.  I can be highly critical, if you like.  Or not.  I can edit for just grammar/mechanics/usage/spelling, or I can do that and add suggestions for content.  If there is something really big that I feel needs to be amended, I won't just change it; I'll write you a little note about a general direction to take to improve that section.  That way, I won't  make huge changes to your story, but I will help you to become a better writer. 
**I do NOT mean bestiality with an unintelligent beast for the sake of sex.  This would only be acceptable if the animal could communicate with the human.  For a good example, see "Love's Limits," one of my favorite stories here.