I don't know how to report people, so I'll take chances by writing it here. Please tell me if I'm doing it wrong.
User togren, joined just yesterday, has been going to years-old posts related to yukkuri abuse and spamming capitalized violent comments with surprisingly flowery language.
Normally this would just give him some vote-downs, but I believe a certain user has been doing them with sockpuppets for some time. Whether or not this user is him again (I find it likely, given how his only activities have been to post violent comments on yukkuri abuse pictures), his comments only serve to make other users in Danbooru frown. Hence I report this user and request that actions be taken, minimal being the deletion of his comments.
Thanking the Danbooru staff
Updated by jxh2154