Blade's Angel by S. Leigh is an evocative, action-packed novel that delves deeply into the realms of dark fantasy and romance. Centered around the enigmatic and intense character Blade, the narrative explores themes of redemption, destiny, and the complex layers of human (and non-human) emotion. This book is not merely a casual read but an immersive journey into a darkly rich universe, where angels and demons aren't just mythical, but tangibly real and dynamically portrayed.

The story unfolds with Blade, a character etched out of shadows and mystery. He is not your typical hero; rather, his past is a tapestry of darkness and sorrow, tinged with moments of profound bravery. Blade's nature and his supernatural aspects are unveiled progressively, maintaining a grip on the reader's curiosity and empathy. Leigh's portrayal of Blade combines the perfect mix of vulnerability and formidable strength, making him a paradox that readers love to decode.

Alongside Blade, the array of supporting characters is diligently crafted, each adding depth and perspective to the overarching narrative. However, it is the character of Angel that stands as the counterbalance to Blade’s darkness. Angel is not merely a love interest or a damsel in distress; she is a formidable force in her own right. Her interactions with Blade are poignant, challenging, and tinged with an electrifying tension that Leigh captures magnificently. The dynamics between Angel and Blade progress from cautious intrigue to a deep, complex connection that serves as the heart of the novel.

The setting of Blade's Angel is in itself a character, painted vividly through Leigh’s descriptive prowess. From the dusky, foreboding alleys of unnamed forgotten cities to sanctified realms hidden within our own, the scenes are set with such detail that one could almost smell the rain-drenched cobbles or feel the chilling winds of the ethereal realms that Leigh conjures. The author’s world-building is not just background; it is essential to the fiber of the story, providing a perfect stage for the drama between celestial and infernal powers to unfold.

What makes Blade's Angel particularly striking is its pace and the impeccable balance between action and introspection. The action sequences are choreographed with a vividness that thrills, each blow and each flight a testament to Leigh's skill at writing combat and tension. These sequences blend seamlessly with moments of introspection, where the characters grapple with complex emotions and moral dilemmas. Leigh manages to weave philosophical questions about fate, freedom, and the nature of good and evil into these moments, without detracting from the urgency of the plot.

The thematic elements in Blade's Angel are both timeless and timely. Questions of consent, the influence of past traumas on present behavior, and the struggles for personal autonomy resonate with current societal issues, adding a layer of contemporary relevance to the narrative. Leigh does not offer easy answers but encourages readers to ponder these issues along with the characters.

However, no book is without its flaws. At times, the intricate plot might seem slightly convoluted, particularly with the introduction of numerous side characters and sub-plots in the middle sections of the book. Some readers might find this overwhelming and possibly distracting from the central story of Blade and Angel. Furthermore, Leigh’s prose, while mostly a delight, occasionally slips into overwrought territories, particularly during the more introspective passages. These minor blemishes notwithstanding, the book remains a compelling read.

In conclusion, Blade's Angel by S. Leigh is a comprehensive blend of dark fantasy and romance that will appeal to fans of both genres. The author's prowess in character development and world-building, coupled with a robust narrative and significant themes, makes this book a standout. For those who are drawn to tales of battle-scarred warriors and powerful, poignant love stories shadowed by larger cosmic battles, Blade's Angel offers a rich, rewarding experience. Leigh shows not just the darkness that lies within and around us, but also the redemptive light that love, whether celestial or infernal, can bring into our worlds.