about (watch out, spoilers above)
Tatsumi Seiichirou (巽 征一郎)
He was an accountant until he died at 29 and became a Shinigami, is the secretary of the Shokan Division. He spends most of his time going through paperwork and working behind the scenes. He was Tsuzuki's third partner and worked with him for three months until, unable to cope with Tsuzuki's pain, he quit. Tsuzuki reminds Tatsumi of his well-born mother, who constantly grieved despite Tatsumi's attempts to take care of her. Tatsumi eventually killed her (or at least blames himself for her death), and the crime still haunts him.
Tatsumi is known above all, however, for his administrative genius. Obsessive about the budget (which, thanks to Konoe's passion for souvenirs and the unintentional destruction that accompanies Tsuzuki's missions, is always in the red), he has micromanaged the Judgment Bureau to the point where he practically runs it. The only person who can squeeze money out of Tatsumi is Tsuzuki, and then only in extreme cases and only for a short time. Even Tsuzuki, however, cannot wring Tatsumi's superb cooking skills out of him for free. For that, one must take a class costing 100,000 yen.
what's a fanlisting?
It's a list of people who like squeeing at a paticular thing or topic, could be also a character like in this case. The idea is that the bigger the list, the more loved that topic or subject is. Also it's good to meet people who like the same things you do.