I doubt you can obtain the same character since based on what the chapters have said so far, the heros are people who have previously died meaning, you can't obtain the same person twice.
Can't say for sure, but I would bet there will be a way to increase his star rank though, and if not I'm sure they'll find a way to glitch the system to "increase" it some how ( ^ ^)r゛゛
When a hero’s mana supply is cut off by the summoner, they can no longer regenerate, and the essence of heroes’ are in their heads. This allows for people to cut below a hero’s neck and have everything but the head disappear since the body would no longer have essence flowing.
About my previous point, I think the heroes need to die for them to be sent back to the summoning pool so just having their mana supply cut off is not enough. I do not really know how they would die unless the summoner is killed or their essence disappears.
All this will probably be explained more in the later chapters so ig I’ll wait.
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since this is a game or like built like a game. and blondie is only 2 stars could it be possible to ascend chapters changing their rank? or even gaining the same character again but a different rank like how it works in some gacha games