Maid-Master relationship in HiMM and Butler-Mistress relationship in Hayate, ecchi, comedy (and young girls, for those of you loli lovers xD) It should be noted that Hayate's art is better and has a more powerful seiyuu cast than HiMM.
HiMM looks more similar to HnG! than Kimiga Aruji because of the crazyness and the dynamism it has inside. The developments are about the same—butler/maids. It's the same battle where debt is the reason for having the characters continue together.
One has a Brother and Sister and the other has Two Sisters, but they're both running away from their parents. At first the viewer is not shown why they left. But they both end up being maids/butlers for pompous rich folk.
If you liked Kimi ga Aruji Shitsuji ga Ore de or better known has They Are My Noble Masters, than you'd probably will like He is my Master because....both are similar how they both deal with kids running away from their home for one reason or another. And end up becoming a butler/maid they both have Ecchi and maids of course and a Harem feel to it and Perverted Masters in them.
Both Anime has the maid and master theme. In both anime the main characters ran away from home. The main characters in both anime become maids to rich masters. He is my master is a bit more of a comedy aproach to the maid anime genre than Kimi ga aruji de shitsuji ga ore de. Both anime are good but I prefer kimi above he is my master.
A girl is "hired" by a boy to do some dirty work, just like Haruhi in the beginning of Ouran. Though, He is My Master is a bit more perverted and is the traditional Harem style anime they both have their emotional moments and their hilarious moments :]
They both have similar feeling to how the main character(s) have to pay off a debt for breaking things. They are forced to work and at first they both are very reluctant but eventually they become comfortable.
Well, both of these series here have what every rich person already have. They have the money, the maids, and almost everything they've ever wanted.
In both series, there is a lot of comedy, drama, and fanservice. The main protagonist in both series are quite different in personality but has similar possessions.
Both series also has some hints of romance as well as a few emotional moments at rare times.
These two series share the same three core elements: maids, boobs, and humour. He is My Master combines the 'maids' and 'boobs' elements into the same characters while Maid Guy has the 'master' characters providing the fanservice, but let's be honest, it doesn't make much of a difference.
The main characters for both shows are very similar. They get in really "awkward" situations and pretty much every girl has a crush on them. Both shows are very funny. He is My Master contains more ecchi than Seto no Hanayome, but aside from that they're pretty similar in harem comedic fun.
Both series have a lot in common in a general sense. A young guy gets young maid/s to work for him. Both series were done by Gainax. Also both have a similar sense of humor. While it takes the similar concept as He is My Master, Mahoromatic does ever thing better. Mahoromatic has a far better story, is funnier, and ecchier.
both have the same maid idea and a little of ecchi., in kore ga watashi... the two sisters ran away from home só they found a job as maids on a mansion of a kid who hes parents just died.,., in mayo chiki the main character discovers the identity of the bulter só she become his maid,.,.,
Master-servant relationship but like HimM, the servant is the one bossing the master around. Great equation for comedy ^_^ FYI: Also Dokuro-chan has very graphic violence and is ecchi. If you love those things as well, please watch!!
Both the masters of their mansion are very talented in making outfits (maid) and other types, plus a specific dress appearing in both series. Also the pets that the main characters bring in these anime cause a bit of trouble to the owners.
Both have a similar humour style - that same random, perverted, and generally crazy funniness is present in both. Also both are harem in a sense, except that in Girls Bravo the main focus is on a guy, whereas in He is My Master, the main focus is on a girl. Chances are if you liked one, you'll like the other.