I learned about robocode while doing a middle school report on artificial intelligence in 2009 and was very active between 2009 and 2012. I mostly work on making nanos/micros and I like to make robots that have different or unusual strategies. I also wrote a lot of the Super Sample Bots, a set of robots created with the goal of being good for beginners to learn from.
Caligula - A nanobot that tries to beat weak bots badly instead of actually being strong. It was the first to use the bullet dodging/ramming combo that is seen in a few top nanos nowadays.
Claudius - A scaled-up version of Caligula that forgoes the last-ditch ramming in favor of random movement.
Corsair - A nano melee bot using oscillator movement and distance control.
Mercutio - A micro melee bot with a fun melee movement based on dodging HOT and LT.
PricklyPear - A mega with extremely simple wavesurfing and guessfactor targeting but a lot of other tricks up it's sleeve.
SavantWS - Not competitive in the slightest, but it has nano-sized wavesurfing (kind of).