Yes, Issei and Rias do have a child in the light novel series "High School DxD." Their child's name is Zen and he is introduced in the sequel series "Shin High School DxD." Zen inherits his parents' powerful abilities and is a significant character in the continuation of the story. **

Yes, Issei and Rias do get engaged in the Highschool DxD series. In the light novel, Issei proposes to Rias and they become engaged. Their engagement is a significant moment in their relationship and reflects their deep love and commitment to each other. This event also plays a pivotal role in the development of their characters and the overall storyline of the series. **

Rias and Issei officially become a couple in the anime series High School DxD in the episode titled "I Will Fight!" which is the final episode of the first season. In this episode, Rias confesses her feelings for Issei and they share a romantic moment together, solidifying their relationship. This marks a significant turning point in their dynamic and sets the stage for their continued development as a couple in the series. **

The women in Highschool DxD like Issei Hyoudou because he is kind-hearted, loyal, and always willing to protect and support them. Despite his perverted tendencies, Issei genuinely cares for his friends and is willing to go to great lengths to keep them safe. Additionally, his determination and willingness to improve himself make him an attractive and admirable figure to the women in the series. **

To find anime boys similar to Issei from Highschool DxD, you can look for anime series within the harem and ecchi genres, as these often feature similar male protagonists. Some popular series with similar characters include "Shinmai Maou no Testament," "Trinity Seven," and "High School of the Dead." Additionally, you can search for anime with the "perverted protagonist" tag on anime databases and forums to find recommendations from other fans. Keep in mind that while these characters may share some traits with Issei, each anime series will have its own unique story and setting. **

Rias is initially obsessed with Issei because she sees potential in him as a powerful and capable member of her demon peerage. She also feels a strong attraction towards him, which grows into genuine love as the series progresses. Additionally, Issei's unique Sacred Gear, Boosted Gear, makes him a valuable asset to Rias and her team, further fueling her initial interest in him. Overall, Rias is drawn to Issei for both his potential as a powerful ally and her growing romantic feelings for him. **

In Highschool DxD Hero, Rias, Akeno, Issei, and Raynare continue to be central characters in the series. Rias and Akeno play significant roles in supporting Issei as he faces new challenges and enemies. Issei continues to grow stronger and develop his relationships with the girls around him. Raynare, on the other hand, remains a villainous character who causes trouble for the main characters. **

Issei from Highschool DxD is certainly a powerful character, especially with his ability to continuously improve his power through the Boosted Gear. However, it's important to note that there are many other anime characters with similarly limitless potential for growth, such as Goku from Dragon Ball or Naruto from Naruto. Additionally, the concept of "strongest" can be subjective and depends on the specific abilities and context within each anime universe. Therefore, while Issei is undeniably strong, it's difficult to definitively say he is the strongest of all anime characters. **