This might be a little bit disturbing for newer fans of the comic and the character, but in her earliest appearances, Gwen Stacy fit this Trope quite nicely. After her death, all flashbacks have shown Gwen as more of a Girl Next Door.
Daisy Duck is an iconic tsundere of Western comics and animation. Her varying between lovey-dovey and cranky is also pretty understandable considering Donald's personality.
Damian Wayne is mean and jerkish to everyone in general. But he clearly sees Dick Grayson as a Big Brother Mentor and respects him, even standing up to his mother on one occasion when she talked bad about Dick. He also treats Stephanie Brown/ Batgirl III and Alfred like this.
Monica (from Brazilian comics Monica's Gang ) is at first portraited as an almost full time tsuntsun kind of character: a hot-tempered little girl with super-strenght, self-proclaimed "the boss of the street" and very feared among other kids. She often uses a huge amount of physical violence to get revenge against her colleague/rival Jimmy Five (Cebolinha on the original), specially when he does any kind of conspiration against her. Still she can sport a very soft and girly side, and surprisingly shows it a lot of times to Jimmy himself.
In the spinoff/sequel of the series Monica's Gang Teen, Monica's personality seems to have melted a bit, as she claims that "has matured with age". As she keeps being a tsundere A type, and beats up (almost) anyone who invoke her rage, now the sentimental deredere side tends to appear more. And, not very surprisingly, she starts a romance with old rival/friend Jimmy Five, showing that all the old quarrels of the past were indeed a form of mutual attraction
I submit for your consideration Yelena Rossini in Transmetropolitan. She fulfils the trope by helping Spider Jerusalem out routinely despite being adamant that she hates his guts, and also subjects him to a hellride of an emotional rollercoaster love affair throughout the series: She has sex with him; denies that she had sex with him (he was too drunk to remember); when she finally admits it, she of course has to do this in a way that deliberately publicly insults him at his own party; she acts possessively over him when sensing rivals (Vita) but still refuses to admit having feelings for him; and they only end up together when she's one hundred per cent sure (or should we say ninety-nine per cent sure) that he's dying. And even then, nobody else are allowed to know that they're together. Compared to the Yelena issue, being marked for death by the President of the USA must be a minor inconvenience to Spider.
Type B (Dere or Sweet)
Susie Derkins from Calvin and Hobbes is generally a very sweet and mild-mannered girl, but is still perfectly willing to retaliate violently at whatever Calvin (see type A) is up to. (Not that that's not a wise way to deal with Calvin.)
Lois Lane of Superman is normally fairly polite and slightly flirty, but Clark Kent seems to always push her buttons. It didn't help that she first met him right after he scooped her on an interview with Superman. Yes, Clark stole a story from Lois by interviewing himself. What a jerk!
This was Gwen Stacy's original personality in the Spider-Man comics, flipping between concerned and lovestruck over Peter to hating his guts for a minor transgression like him not responding to Harry Osborn's jokes. After her death, however, she was Flanderized in the minds of most readers and writers into a Purity Sue.
While both Gwen and Liz Allen have aspects of this in Spectacular Spider-man.
She's also like this towards her students. She may seem like a harsh headmistress at first, but harm any one of them (yes, even X-23) and she goes into full on Mama Bear mode.
Many incarnations of Lois Lane over the years could be called tsundere. Superman almost always gets the dere side and everyone else gets mostly tsun, but there's overlap; once she's known Clark for a while, she tends to be about half-and-half with him. Teri Hatcher's Lois on Lois and Clark was definitely tsundere.
Now that she's been married to Clark in the comics for fifteen years, he and Perry and Jimmy have exclusive rights to her dere side while everyone else gets her (genuinely intimidating) tsun side.
Lucy van Pelt. As mentioned in a Peanuts Gallery TV special, she can start off very sweet, and then she boils over. And she's especially "dere" to her would-be boyfriend Schroeder, much to his displeasure.
She could be a tsundere with a heart of yandere. In one comic, she beats up another girl who leans on Schroeder's piano.
99% of Calvin's interactions with the neighbourhood girl Susie Derkins are about him annoying her (and occasionally her violent retaliations, see Type B). Word Of God says it's his way of dealing with his crush on her. The remaining 1% consists of the school baseball arc, during which they were just fine.
A non-romantic example, Power Girl in Justice League Europe definitely had elements of this. She was generally very irritable, if not outright hostile, toward most of the League, but she was great friends with Captain Atom. Justified in that much of her hostility was provoked by people constantly ogling her, which Cap did not do.
Miss Ofelia, from Spanish comics Mortadelo Y Filemón: she is most of time in a very bad mood due to the (usually) unrespectful stupidities made by her colleagues of work (especially her love interest/source of annoyance Mortadelo). But in the rare occasions when is not provoked by them, uses to act into a very fluffy and girly mode. What leads the readers to think what could be her natural behavior.
