Any novels with characters that have great friendships (not a romantic relationship). It can be siblings, classmate, teammate, etc. Kinda like the relationship between Ye Lang and Zhen Xiao Yan in The Silly Alchemist. It can be novel (RRL, NU), manga, or anime. +1 if it's with the opposite gender.
Ze Tian Ji him and Tang 36 Transcending the nein heavens ( the mc and his group of "brothers") Da Tang Shuang Long Zhuan
So far Abyss Domination (60ch), and I don't think it will change, but it could, since while the MC and his little sister share the same mother and Vivian is only 8 years old, they do have different fathers and you never know how crazy authors are for their harems. (But I don't think so, so far MC is just a caring older brother with absolutely no romantic or perverted thoughts between the siblings.) I do have to apologise a bit because nobody is translating it and there's only MTL on LNMTL, but the novel is really good and I hope other people will read it... >:<
Virtual world: Peerless white emperor A couple of idiots who are best of friends and abnormal in one way or another. Quite a fun read.
http://www.novelupdates.com/series/undefeated-god-of-war/ http://www.novelupdates.com/series/world-of-cultivation/ These are probably two of the best stories with what you are looking for on nuf. with most novels on this site any relationships tend to devolve into a sidekick dynamic with the side characters having very little presence or impact on the plot. Take Coiling Dragon for example while the little rat guy is there for most of the story almost nothing about him ever actually matters to the plot or development of events (not that CD is terrible or anything). Those two novels I suggested have probably the strongest cast of characters of any of the novels on nuf with lots of development and distinctive personalitys there also two of my favorite novels on here in general (they are also hilarious)