It's the big grumpy but fatherly tiger whom you might see once you've finished your studies for the day, even at night!
... AKA Lars Dearmer from AfterClass

You had a lot of classes that day. Your classes were stacked one after the other over and over that you're only finished after the sky had gone dark. Still, you'd planned to hangout with Lars, and the big tiger had agreed to meet you on that particularly day even after you'd shown him your busy schedule. You ran as quickly as you could to where you'd agreed to meet with Lars, relieved to be doing something else other than studying. However, as you approached him now, you noticed that Lars was leaning on a fence wall with his arms crossed and frowning. Hopefully you hadn't made him wait too long in the dark or had annoyed Lars that you could only hang out so late in the day. Knowing him, Lars was probably feeling just fine and the bad mood look was simply his neutral expressions. Or, perhaps, he was trying to look as intimidating as possible so that no one, especially bad people, would approach the area and thus keep the two of you relatively safe even when the sun no longer shined.
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This artwork was shaded in a way I don't usually do, and I think I now remember why I don't usually do it this way haha. I also kept getting under the weather, and IRL stuffs kept happening, while drawing this, but I hope it doesn't look too bad.
The background is basically just a recreation of the alley background from the VN itself.
This is sort of meant to be a phone wallpaper, it should hopefully still look good even when used on screens taller than 16:9.