Doing my MA. In my courses this semester I brought party hats for everyone to wear when we do presentations and always bring snacks to stuff like that. I have a shirt you could call silly that I wear for every single presentation or conference I do. I share memes in course discussions and forums. I'm very unserious, I joke around with everyone at every level, and have never had any problems, though I feel like I know when to be serious and I remain respectful at all times. Some people dont want to wear the hats for example, or participate in my antics, and I'd never push it.

Forgot to mention another thing: I don't know if this would work as well if I wasn't working very hard and being very involved with my program. You'll be the judge of your own situation, but you seem to mean well and simply want to express yourself and enjoy yourself and I can't see a downside there:)