He doesn't try to be evil, but as they say, it is a trap, after all, in multiple meanings of the word. Just don't get distracted when he sings. Also don't touch the necklace, that'll just end bad for both of you.
The cutie mark is based off SWS album cover With Ears To See, And Eyes To Hear the necklace is based off a real SWS necklace that in and of itself is based off a different SWS album cover Feel. His shirt is a Bring Me The Horizon shirt basically like this one just more brown. His other form has this color pattern on it instead of a plain color to look like this design.
Whew, lots of stuff. Also as a vaguely related note, I listened to Bring Me The Horizon Live at the Royal Albert Hall as I was working on these, both days, just in loop over and over. It's really damn amazing. Coincidentally, I started listening to both SWS and BMTH at the exact same time, so my mind likes to mentally connect them for some reason, so thus, that's why he's wearing this shirt.
Also it took me several hours, a night's worth of sleep, and tons of stress over getting his mane perfect. It looks simple, but looks can be deceiving. Also his muzzle is a custom shape, top part is based off basic mare muzzle, bottom part is my usual Saffron Masala muzzle, so he looks more feminine without being entirely as such.