You could try 'My Hero Academia'. Both have complex characters and engaging storylines. Also, the art styles are somewhat comparable. However, they have their unique twists and turns.
One manga that might be similar is 'The Promised Neverland'. It has a similar level of excitement and mystery.
You might like 'Solo Leveling'. It has exciting action and character development like in Second Life Ranker. Plus, the world-building is quite immersive.
I'd recommend 'Solo Leveling'. It has a similar focus on a protagonist's growth and power-ups.
Both usually have complex world-building and diverse character development. The plotlines tend to involve challenges and achievements for the main characters.
There are a few like 'Solo Leveling' which shares similar action and adventure elements.
It stands out with its unique plot and well-developed characters. The art style is also quite captivating.
Try 'Tower of God'. It has a complex story and diverse characters, similar to the ones in 'Ranker Who Lives a Second Time'. The plot keeps you hooked throughout.
Mangas similar to Second Life Ranker could include 'Overlord' and 'Dungeon Reset'. These have action, fantasy, and characters striving for power and success in their respective worlds.
This manga is similar to others in terms of its art style, which attracts readers. Also, the way it builds suspense and keeps you hooked is something you'll find in many comparable mangas.
I think 'Solo Leveling' might be somewhat similar. Both have elements of adventure and power growth for the main character.
It's about a powerful ranker who gets a second chance at life and embarks on an epic adventure filled with challenges and growth.