Big Fancy House: In the "Boss Spain" strips Spain and young!Romano (and maybe Belgium and Netherlands too) live in a castle. Justified Trope, this is Imperial!Spain we're talking about.
Big Damn Heroes: Spain pulls a Papa Wolf and rescues South Italy from Turkey. Then, Turkey declares war and Spain almost goes bankrupt funding the war effort.
Doting Parent: Dangerously combined with his Shotacon tendencies. Too bad Romano slaps him in the face every time Spain tries to be nice.
"When he drinks wine, he becomes sentimental, and if he gets drunk, you better put some distance between you and him!"
Latin Lover: While not shown in-series, Spain alludes to this idea of him while assuring Turkey that while he is "sensually misleading to the eye" he's still very much a Badass.
Fandom of course ran with this idea long before that dub came out.
Nice Guy: Spain's major personality trait. Though thanks to Spain/Romano being a very popular ship, he isn't as overlooked in the fandom as you might expect.
Sadly, the times when he shows a different side are taken as "undeniable proof" that Spain MUST be a yandere or Cute and Psycho, despite being mostly Played for Laughs. See below.
Surprise Santa Encounter: Double Subverted. Belgium and Romano knew Netherlands was setting up a meeting with Santa... The surprise was when he brought a spaced-out Spain over his shoulder while dressed as reindeer. They were horrified, but at least no money was spent!
Toros y Flamenco: Quite averted: he has only appeared in a matador costume in one official art, not in the strips, and doesn't seem to be a Latin Lover. The fanartists, on the other hand...
Trademark Favorite Food: Spain loves tomatoes, and has taught S. Italy to do the same. And like any good Team Mom, he has learnt how to settle disputes with sweets, more exactly churros.
Word Of God also says that he was two-faced like Russia and either very severe or cruel to his colonies that are not South Italy. To be fair, those notes are very old and were taken off Hidekaz's proper site, so we don't know how true they are right now.
This was mostly Played for Laughs with in the 2011 Fool's Bath. He gives a rather crazy look when France was about to spill who the true culprit of the event was, then he switched to his happy face and claimed that the letters he sent were meant to be a group hang out and not meant to be threatening.
Italy: Hey Germany! My older brother Romano is here, isn't he so cool?
Germany: Er, ya it's nice to meet you.
Italy: See I'm the Northern half, and Romano's the southern half! We were occupied separately, so my brother has been with Spain longer than he has with me! Come on Romano, say hello!
Romano: (to Germany) Munch on a bullet, potato freak.
Germany: Uh!?
The Dub Version has some interesting alterations *
(Italy): Hey Germany, check it cool! This is my big brother Romano. Isn't he shizzy? **(Germany): I am Germany. A pleasure. **(Italy): I'm the north of the country, and he's the southern part. Since we've always been governed separately, he had to spend more time with our big brother Spain so he's become kind of a dick! Right? Now say "Hi" to my friend! **(Romano): (to Germany) Suck my balls, you damn potato eater! **(Germany): Uh!?
Large Ham: At least in the English version. Ian Sinclair's helped him become something of a Fountain of Memes
And there is an incestuous version of this when Romano and Italy get their hair curls/erogenous zones tangles together...while naked in bed. Then Germany answers Italy's distress call and untangles them.
Idiot Hair: Like his brother's, it acts as his erogenous zone.
Sir Swears-a-Lot: Ties with England as the most foul-mouthed character in the entire series.
Spell My Name with an S: A bit lighter compared to the other characters, but some fans tend to use "Rovino," an actual Italian name meaning something along the lines of 'collapse,' instead of "Lovino," which isn't actually a given name (but a surname) but was just copied en masse due to L/R confusion.
Tsundere: South Italy is a fierce mix of all Type A varieties, partly out of insecurity that Spain only wants him for his inheritance and partly that his lack of domestic/artistic talents makes him inferior to his little brother. And yep, Romano's Tsundere side is specially strong when around Spain.
The Mafia: Seen once as thugs. Informs his outlook. It makes a lot of difference to the page quote which Italy you mean.
The Other Darrin: In the case of his younger self, initially voiced by his older self's actor in the first episode, then switched in episode 60.
Precocious Crush: He was chasing skirts ever since he was a little child, as shown when he hits on Queen Joanna of Castile, and by his reactions when he meets Belgiumin the printed manga.
The Unfavorite: To some degree, especially during his "childhood" days when Spain was more fixated on North Italy than him. He was seriously worried that he didn't have anything to offer, lacking his brother's domestic and artistic skills.
It is hinted that the reason he is so mean to Spain is that he has abandonment issues-and considering that Ancient Rome chose to leave with North Italy instead, that Spain tried to swap him for his little brother, and that he thinks Spain only wants him for his inheritance, no one here can really blame him.
Oh, and Spain passed up saving Romano that one time because he had to make 500 roses instead. To be fair, Spain's own economy was in no condition to save anyone, and he also felt really bad about it.
Fan Nickname: Himaruya has mentioned "Carlos Machado" as a possible human name. Rached a minor Memetic Mutation level when, whenever there was a mention of him online, some fans commented with "CARLOS MACHADOOOOOOO" in All Caps.
Nice Guy: Other than his Sitcom Archnemesis with America, he's actually a pretty sweet guy; he's good friends with Canada, he approaches Switzerland during the Hetaween 2011 event, and takes care of Seychelles when she nearly passes out from the cold during the 2011 Bloodbath.
Bokukko: In a rather odd variation, Monaco isveryfeminine, but according to Word Of God, her manner of speech mirrors that of a middle aged man.
Brainy Brunette: Subverted, she was initially a brunette but it seems she's now a blue-eyed blonde, via the notes given on her in the volume 3 special edition.
Apparently, in the last profile picture Himaruya took a third option and gave her dark blonde hair, which can be seen as light brown too.
Hair Color Dissonance: Is it dark brown, light brown, dirty blond or platinum blond?
Like Brother and Sister: Notes say her and France's relationship comes off as this. Although France being France, he probably doesn't see it the same way as she does.
Princesses Prefer Pink: Even though she's not necessarily a princess, being a nation as well as a principate comes pretty darn close.
Professional Gambler: You need to know how to play Poker if you ever hope to date her. Also, as noted in her profile, she owns and loves casinos.
Shorter Means Smarter: She's often referred to as an honor student, and in a recent blog post, she was revealed to be shorter than Liechtenstein.
The Gambler: According to her profile, while she didn't build the famous casinos, she still loves them to the point she's even drawn with cards around her!