I think Fujita does great with building up characters but sometimes it's exhausting how many times he sets up character lore in great detail.
We've had...
Seiichi explaining the alien planets
Zanka explaining how he got involved with Souboutei mixed with Kaerikuro
Deido explaining how he got involved with the aliens and ANOTHER background check on him and his sister
That's not including all the brief chapters on all the other characters, which I give a pass to because they are, as mentioned, brief.
At the very least, it's not as lengthy as explaining the 200 year history of multiple semi-immortals. But sometimes I just toss back my head and think "God it's another flashback".